RetroCompass
RetroCompass

RG35XX SP — Custom firmware

Quick answer

Button combo

POWER(boots whichever OS is on TF1)

Steps

  1. 1Pick a community OS for the H700: muOS, Knulli or ROCKNIX (all publicly released).
  2. 2Download the device-appropriate image from the project's official site/GitHub and unzip it.
  3. 3Flash the image to a spare TF1 (OS) microSD card with balenaEtcher.
  4. 4Keep your ROMs on TF2 (some firmwares want it formatted FAT32 or EXT4 — follow that project's guide).
  5. 5Insert the card in TF1, power on, and complete the firmware's first-run setup.
Last verified: 2026-06-20Source: anbernic.com

The RG35XX SP uses the Allwinner H700, so it can boot publicly released community operating systems by simply flashing them to the TF1 (OS) microSD card with balenaEtcher — the same swap-the-card method as the stock OS, with no modification to the device itself. Popular choices are muOS (fast, hotkey-driven), Knulli (Batocera/EmulationStation based) and ROCKNIX; your ROMs stay on the TF2 card. Note many H700 community images target the 2GB-RAM hardware revision, so confirm compatibility, and always keep your original stock TF1 card so you can switch back. This is a DRAFT for human review.

FAQ

Do I have to modify the device to run custom firmware?
No. These are publicly released OS images that boot from the TF1 microSD card. You just flash a card with balenaEtcher and swap it in; keep the stock card to return to Anbernic OS.
Where do my games go?
On the TF2 card. Each firmware (muOS, Knulli, ROCKNIX) has its own ROM folder layout and card format, so follow that project's official guide.

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