Check availability
Reported shipments Oct 21 Nov 8 124 reports

GammaOS on Retroid Pocket Duo: support and development status

Customized Android firmware family with the GammaOS Nano console interface.

DownloadsWebsiteProject repositoryDocumentation
Systems
Operating systems
Newest checked release
v1.4.4-ANBERNICRGDSOct 3, 2026
Two-screen support
Not confirmed
Duo support
not listedThe regular Pocket Duo is not in the official supported-device table. Two reviewers have shown Duo Lite betas, one of them Nano 1.5, but there is no regular Duo image to download.
On this page

Recent reports

Individual reports; versions and hardware may differ.

· Developer report

The GammaOS developer described GammaOS Nano as a work in progress with no ETA, after sharing clips that include a 3DS battle at 6x resolution using Turnip. The post does not say which device the clips came from, and there is no public build yet.

· Community report

A screenshot shared by an owner shows what owners say is the GammaOS developer answering a question about a Duo build with "eventually", after clearing a backlog, and saying people will be fine without Nano on this one for a while. A partly cut-off post shared by another owner describes an early, unoptimised Duo test at 6x with no Turnip driver, without naming the emulator or game. No Duo build is available.

· Developer report

Someone describing official LineageOS work for the Duo says it is separate from GammaOS, which they describe as a GSI using stock-ROM implementations. There is no released Duo LineageOS build, and no public build or source yet.

From Duo reviews

Reported settings and results. A tested build may differ from the latest release.

Tested hardware: Retroid Pocket Duo Lite

The stream uses a Duo Lite 6 GB / 128 GB with a developer-supplied GammaOS Nano 1.5 beta and its bundled Azahar Nano player. The reviewer starts at 2× resolution, maximum performance and automatic fan control.

firmware
GammaOS Nano 1.5 beta (review build)
emulator
Azahar Nano (bundled player)
default resolution
2×
performance mode
Maximum
fan
Auto
Review page · 20:55forthenext · 20:55 ↗

Taken from what the reviewer says; the settings on screen weren't checked.

More detail
  • Duo Lite (6 GB / 128 GB) on the GammaOS Nano 1.5 beta, build not shown. Not tested on a regular Duo.
  • The beta version is mentioned at 1:56 and the setup controls at 20:55. The stream does not say whether the beta is public or works on a regular Duo.
GammaOS

Tested hardware: Retroid Pocket Duo Lite

The reviewer reports a hard lock after leaving fast-forward in this Duo Lite beta test. The issue is described as still being worked on.

firmware
GammaOS Nano 1.5 beta (review build)
emulator
Azahar Nano (bundled player)
resolution scale
2×
Review page · 23:23forthenext · 23:23 ↗

Taken from what the reviewer says; the settings on screen weren't checked.

More detail
  • Duo Lite (6 GB / 128 GB) on the GammaOS Nano 1.5 beta, build not shown. Not tested on a regular Duo.
  • Fast-forward was toggled before the lock, but the cause is unclear.
GammaOS

Tested hardware: Retroid Pocket Duo Lite

At 2× on the Lite there is some flickering. Controls then appear stuck after a Circle Pad Pro option is changed; the reviewer is unsure whether the emulator crashed.

firmware
GammaOS Nano 1.5 beta (review build)
emulator
Azahar Nano (bundled player)
resolution scale
2×
Review page · 28:40forthenext · 28:40 ↗

Taken from what the reviewer says; the settings on screen weren't checked.

More detail
  • Duo Lite (6 GB / 128 GB) on the GammaOS Nano 1.5 beta, build not shown. Not tested on a regular Duo.
GammaOS

Tested hardware: Retroid Pocket Duo Lite

The reviewer reports good speed in a short stretch at 2× on the Lite, including fast-forward headroom. Much of what was shown is opening dialogue rather than demanding combat.

firmware
GammaOS Nano 1.5 beta (review build)
emulator
Azahar Nano (bundled player)
resolution scale
2×
Review page · 34:15forthenext · 34:15 ↗

Taken from what the reviewer says; the settings on screen weren't checked.

More detail
  • Duo Lite (6 GB / 128 GB) on the GammaOS Nano 1.5 beta, build not shown. Not tested on a regular Duo.
  • A higher resolution is suggested but was not tested.
GammaOS

Tested hardware: Retroid Pocket Duo Lite

The reviewer reports 60 fps at the default 2× setting on Lite, with a brief rendering disturbance that clears. Only early gameplay was shown.

firmware
GammaOS Nano 1.5 beta (review build)
emulator
Azahar Nano (bundled player)
resolution scale
2×
Review page · 41:03forthenext · 41:03 ↗

Taken from what the reviewer says; the settings on screen weren't checked.

More detail
  • Duo Lite (6 GB / 128 GB) on the GammaOS Nano 1.5 beta, build not shown. Not tested on a regular Duo.
  • The reviewer blames shaders for the disturbance.
GammaOS

Tested hardware: Retroid Pocket Duo Lite

The reviewer returns from 3× to 2× for more fast-forward headroom. On the Lite it reaches roughly 200% speed, with brief stutters and occasional dips below normal speed.

firmware
GammaOS Nano 1.5 beta (review build)
emulator
Azahar Nano (bundled player)
resolution scale
2× after a brief 3× trial
Review page · 47:04forthenext · 47:04 ↗

Taken from what the reviewer says; the settings on screen weren't checked.

More detail
  • Duo Lite (6 GB / 128 GB) on the GammaOS Nano 1.5 beta, build not shown. Not tested on a regular Duo.
  • The fast-forward percentage is separate from the game’s frame rate.
GammaOS
Show 21 more from reviews

Tested hardware: Retroid Pocket Duo Lite

The reviewer calls it playable on the Lite but reports slowdown later in the sequence. A stand helps with the original touch controls; no control mod is installed.

firmware
GammaOS Nano 1.5 beta (review build)
emulator
Azahar Nano (bundled player)
resolution scale
2× default
Review page · 57:07forthenext · 57:07 ↗

Taken from what the reviewer says; the settings on screen weren't checked.

More detail
  • Duo Lite (6 GB / 128 GB) on the GammaOS Nano 1.5 beta, build not shown. Not tested on a regular Duo.
  • Resolution is the stream’s default, not shown again here.
GammaOS

Tested hardware: Retroid Pocket Duo Lite

The reviewer confirms 2× on Lite but finds repeated black flickering distracting enough to question the experience. Fast-forward headroom does not resolve that rendering problem.

firmware
GammaOS Nano 1.5 beta (review build)
emulator
Azahar Nano (bundled player)
resolution scale
2×
Review page · 64:58forthenext · 64:58 ↗

Taken from what the reviewer says; the settings on screen weren't checked.

More detail
  • Duo Lite (6 GB / 128 GB) on the GammaOS Nano 1.5 beta, build not shown. Not tested on a regular Duo.
  • The reviewer blames shaders for the flickering.
GammaOS

Tested hardware: Retroid Pocket Duo Lite

The reviewer reports that the Lite battle shown runs well without the flickering seen in the earlier Fire Emblem test. Only one short battle was shown.

firmware
GammaOS Nano 1.5 beta (review build)
emulator
Azahar Nano (bundled player)
resolution scale
2× default
Review page · 73:04forthenext · 73:04 ↗

Taken from what the reviewer says; the settings on screen weren't checked.

More detail
  • Duo Lite (6 GB / 128 GB) on the GammaOS Nano 1.5 beta, build not shown. Not tested on a regular Duo.
  • Resolution is the stream’s default, not shown again here.
GammaOS

Tested hardware: Retroid Pocket Duo Lite

The reviewer reports slowdowns in the Lite flight footage and suggests trying 1×, which is not tested.

firmware
GammaOS Nano 1.5 beta (review build)
emulator
Azahar Nano (bundled player)
resolution scale
2× default
Review page · 81:12forthenext · 81:12 ↗

Taken from what the reviewer says; the settings on screen weren't checked.

More detail
  • Duo Lite (6 GB / 128 GB) on the GammaOS Nano 1.5 beta, build not shown. Not tested on a regular Duo.
  • The reviewer also comments on uneven audio mixing.
GammaOS

Tested hardware: Retroid Pocket Duo Lite

The Lite footage shows persistent rendering corruption even though the reviewer says speed looks fine. The reviewer questions whether it is playable in this beta setup.

firmware
GammaOS Nano 1.5 beta (review build)
emulator
Azahar Nano (bundled player)
resolution scale
2× default
Review page · 87:10forthenext · 87:10 ↗

Taken from what the reviewer says; the settings on screen weren't checked.

More detail
  • Duo Lite (6 GB / 128 GB) on the GammaOS Nano 1.5 beta, build not shown. Not tested on a regular Duo.
GammaOS

Tested hardware: Retroid Pocket Duo Lite

At a confirmed 1× on Lite, the reviewer describes the opening as only partly playable and still demanding.

firmware
GammaOS Nano 1.5 beta (review build)
emulator
Azahar Nano (bundled player)
resolution scale
1×
Review page · 93:20forthenext · 93:20 ↗

Taken from what the reviewer says; the settings on screen weren't checked.

More detail
  • Duo Lite (6 GB / 128 GB) on the GammaOS Nano 1.5 beta, build not shown. Not tested on a regular Duo.
  • A viewer suggests a render-thread delay later in the stream, but it was not tried.
GammaOS

Tested hardware: Retroid Pocket Duo Lite

After a slower introduction, the reviewer tries 2× on Lite and reports that the shown gameplay is okay. Menus or scenes outside gameplay remain slower.

firmware
GammaOS Nano 1.5 beta (review build)
emulator
Azahar Nano (bundled player)
resolution scale
2× in the later sample
Review page · 107:11forthenext · 107:11 ↗

Taken from what the reviewer says; the settings on screen weren't checked.

More detail
  • Duo Lite (6 GB / 128 GB) on the GammaOS Nano 1.5 beta, build not shown. Not tested on a regular Duo.
  • Only early gameplay was shown, and the introduction was less consistent.
GammaOS

Tested hardware: Retroid Pocket Duo Lite

The reviewer confirms 2× on Lite and plays brief running and judo events. No frame rate or overall verdict is given.

firmware
GammaOS Nano 1.5 beta (review build)
emulator
Azahar Nano (bundled player)
resolution scale
2×
Review page · 112:44forthenext · 112:44 ↗

Taken from what the reviewer says; the settings on screen weren't checked.

More detail
  • Duo Lite (6 GB / 128 GB) on the GammaOS Nano 1.5 beta, build not shown. Not tested on a regular Duo.
GammaOS

Tested hardware: Retroid Pocket Duo Lite

The reviewer completes a short Lite play session and praises the D-pad for repeated inputs. No frame rate or latency figures are given.

firmware
GammaOS Nano 1.5 beta (review build)
emulator
Azahar Nano (bundled player)
resolution scale
2× default
Review page · 118:05forthenext · 118:05 ↗

Taken from what the reviewer says; the settings on screen weren't checked.

More detail
  • Duo Lite (6 GB / 128 GB) on the GammaOS Nano 1.5 beta, build not shown. Not tested on a regular Duo.
  • Resolution is the default announced at the start of the stream.
GammaOS

Tested hardware: Retroid Pocket Duo Lite

The reviewer reports good Lite gameplay speed but notices the lower-screen interface disappearing around fast-forward changes, then returning. The cause remains unclear.

firmware
GammaOS Nano 1.5 beta (review build)
emulator
Azahar Nano (bundled player)
resolution scale
2× default
Review page · 126:34forthenext · 126:34 ↗

Taken from what the reviewer says; the settings on screen weren't checked.

More detail
  • Duo Lite (6 GB / 128 GB) on the GammaOS Nano 1.5 beta, build not shown. Not tested on a regular Duo.
  • The reviewer asks about a 20 fps reading but never resolves it.
GammaOS

Tested hardware: Retroid Pocket Duo Lite

In a very brief Lite test, the reviewer reports flickering similar to the earlier Fire Emblem test. It is too short to say how the whole game runs.

firmware
GammaOS Nano 1.5 beta (review build)
emulator
Azahar Nano (bundled player)
resolution scale
2× default
Review page · 132:02forthenext · 132:02 ↗

Taken from what the reviewer says; the settings on screen weren't checked.

More detail
  • Duo Lite (6 GB / 128 GB) on the GammaOS Nano 1.5 beta, build not shown. Not tested on a regular Duo.
  • Fast-forward is used and the reviewer calls this a quick test.
GammaOS

Tested hardware: Retroid Pocket Duo Lite

The reviewer plays several short fights on Lite and reports a good result. The resolution used is not stated.

firmware
GammaOS Nano 1.5 beta (review build)
emulator
Azahar Nano (bundled player)
Review page · 135:40forthenext · 135:40 ↗

Taken from what the reviewer says; the settings on screen weren't checked.

More detail
  • Duo Lite (6 GB / 128 GB) on the GammaOS Nano 1.5 beta, build not shown. Not tested on a regular Duo.
  • Before launch, the reviewer suggests 1× may be needed, but does not confirm it was the active setting.
GammaOS

Tested hardware: Retroid Pocket Duo Lite

This video revisits a 6 GB Duo Lite using a developer-supplied GammaOS preview. The reviewer reports a substantial improvement over their earlier stock experience and uses Max performance. The preview is a beta, not a public stable release.

firmware
GammaOS developer-supplied beta / preview; numbered build unknown
hardware
6 GB Duo Lite, 16-bit colour (description)
performance
Max; also visible in the 13:55 menu
3ds player
Azahar Nano label visible at 13:55; exact build unknown
Review page · 0:19V1cariousGaming · 0:19 ↗

Taken from what the reviewer says and shows.

More detail
  • Frame rates and responsiveness are the reviewer’s impressions on a Duo Lite.
  • It is not clear that this beta is the same as the numbered 1.5 beta in forthenext’s stream.
  • At 13:55 the screen shows Azahar Nano, Max performance and Auto fan. How Azahar Nano relates to upstream Azahar is unknown.
  • The reviewer mentions an eventual free release and a 90-day window, neither confirmed.
GammaOS

Tested hardware: Retroid Pocket Duo Lite

In Sonic Rush on Lite’s GammaOS preview, the reviewer reports smooth motion and closely synchronised screens by eye, with fast-forward headroom.

firmware
GammaOS developer-supplied beta / preview; numbered build unknown
hardware
6 GB Duo Lite, 16-bit colour (description)
ds player
Bundled DS player; exact identity and build not established
hi res 3d
On, visible at 5:05
threaded 3d
On, visible at 5:05
gpu 3d renderer experimental
Off, visible at 5:05
run ahead experimental
Off, visible at 5:05
Review page · 4:23V1cariousGaming · 4:23 ↗

Taken from what the reviewer says and shows.

More detail
  • Frame rates and responsiveness are the reviewer’s impressions on a Duo Lite.
  • The reviewer describes the DS settings as 2×, but the menu shows Hi-res 3D On rather than a number.
GammaOS

Tested hardware: Retroid Pocket Duo Lite

The reviewer finds the WarioWare touch microgames responsive on Lite’s GammaOS preview and better than their earlier stock experience. The exact WarioWare edition is unknown and no latency figure is given.

firmware
GammaOS developer-supplied beta / preview; numbered build unknown
hardware
6 GB Duo Lite, 16-bit colour (description)
Review page · 6:30V1cariousGaming · 6:30 ↗

Taken from what the reviewer says; the settings on screen weren't checked.

More detail
  • Frame rates and responsiveness are the reviewer’s impressions on a Duo Lite.
GammaOS

Tested hardware: Retroid Pocket Duo Lite

The Legend of Zelda: Spirit Tracks touch controls are described as substantially better than stock on Lite’s GammaOS preview, but the reviewer still notices some delay. They call the short rock-picking and throwing stretch playable.

firmware
GammaOS developer-supplied beta / preview; numbered build unknown
hardware
6 GB Duo Lite, 16-bit colour (description)
Review page · 9:03V1cariousGaming · 9:03 ↗

Taken from what the reviewer says; the settings on screen weren't checked.

More detail
  • Frame rates and responsiveness are the reviewer’s impressions on a Duo Lite.
  • Only the 6 GB model was tested. The reviewer guesses a 4 GB model may behave similarly, but did not test it.
GammaOS

Tested hardware: Retroid Pocket Duo Lite

Pokémon Black Version 2 has a positive boot and title sequence on Lite’s GammaOS preview, including fast-forward headroom. Demanding battles and later areas were not shown.

firmware
GammaOS developer-supplied beta / preview; numbered build unknown
hardware
6 GB Duo Lite, 16-bit colour (description)
Review page · 10:50V1cariousGaming · 10:50 ↗

Taken from what the reviewer says and shows.

More detail
  • Frame rates and responsiveness are the reviewer’s impressions on a Duo Lite.
  • The title screen at 11:38 shows Black Version 2. Most of the footage is startup.
GammaOS

Tested hardware: Retroid Pocket Duo Lite

Pokémon X gets a positive verdict in a short test on Lite’s GammaOS preview, with shader-compilation stutter and occasional graphical issues reported. The Azahar Nano menu shows 2× with dynamic resolution On, so it was not a fixed 2× throughout.

firmware
GammaOS developer-supplied beta / preview; numbered build unknown
hardware
6 GB Duo Lite, 16-bit colour (description)
3ds player
Azahar Nano, visible at 13:55; exact build unknown
resolution
2× selected, visible at 14:00
dynamic resolution
On, visible at 14:00
performance
Max, visible at 13:55
fan
Auto, visible at 13:55
Review page · 12:20V1cariousGaming · 12:20 ↗

Taken from what the reviewer says and shows.

More detail
  • Frame rates and responsiveness are the reviewer’s impressions on a Duo Lite.
  • The player and settings are on screen; frame rate and graphical issues are as the reviewer describes them.
GammaOS

Tested hardware: Retroid Pocket Duo Lite

Fire Emblem Awakening’s opening and tutorial battle get a positive verdict on Lite’s GammaOS preview, with some dips. The reviewer had already run the game once to compile shaders, so a first launch may run worse.

firmware
GammaOS developer-supplied beta / preview; numbered build unknown
hardware
6 GB Duo Lite, 16-bit colour (description)
shader cache
Reviewer had already run the opening once
resolution
Not independently established for this game
Review page · 14:26V1cariousGaming · 14:26 ↗

Taken from what the reviewer says and shows.

More detail
  • Frame rates and responsiveness are the reviewer’s impressions on a Duo Lite.
  • The title screen at 14:41 shows the game is Awakening. How it runs through longer battles is unknown.
  • Pokémon X’s dynamic-resolution setting was not confirmed for this game.
GammaOS

Tested hardware: Retroid Pocket Duo Lite

A Monster Hunter 3DS test gets a positive verdict after shader compilation, with occasional glitches reported. It is unclear which Monster Hunter game this is.

firmware
GammaOS developer-supplied beta / preview; numbered build unknown
hardware
6 GB Duo Lite, 16-bit colour (description)
Review page · 18:11V1cariousGaming · 18:11 ↗

Taken from what the reviewer says; the settings on screen weren't checked.

More detail
  • Frame rates and responsiveness are the reviewer’s impressions on a Duo Lite.
GammaOS

Tested hardware: Retroid Pocket Duo Lite

Luigi’s Mansion: Dark Moon remains a poor result in the Lite GammaOS preview. The reviewer lowers resolution to Native (1×) and disables dynamic resolution, then reports little improvement, and it is still not playable.

firmware
GammaOS developer-supplied beta / preview; numbered build unknown
hardware
6 GB Duo Lite, 16-bit colour (description)
3ds player
Bundled 3DS player; Azahar Nano is identified earlier in the session
resolution
Native (1×), visible at 21:57
dynamic resolution
Off, visible at 21:57
Review page · 20:38V1cariousGaming · 20:38 ↗

Taken from what the reviewer says and shows.

More detail
  • Frame rates and responsiveness are the reviewer’s impressions on a Duo Lite.
  • The 21:04 title screen shows Dark Moon, not the original Luigi’s Mansion, and the 21:57 menu shows Native (1×) and Dynamic Resolution Off.
  • There is no before-and-after comparison after a restart.
GammaOS
Version and support notes

Nano is the console-style interface inside GammaOS, and we found no separate TheGammaSqueeze/GammaOSNano repository.

Releases are device-specific; the newest project release may target an Anbernic or another unrelated handheld.

Sources

Setup guides

Game notes using this tool

Show 15 more

Card screenshots come from Libretro, not from a Duo.

All operating systems

Reviews covering this tool