RetroCompass
RetroCompass

RG35XX H — Custom firmware

Quick answer

Button combo

Flash CFW image to microSDboot from that card

Steps

  1. 1Pick a CFW for the H700: muOS, Knulli, ROCKNIX, Batocera, MinUI or GarlicOS (alpha).
  2. 2Download the device image (.img/.img.gz) from the project's official site or GitHub releases.
  3. 3Flash it to a microSD with balenaEtcher, Rufus or Raspberry Pi Imager.
  4. 4Use a two-card setup: CFW on TF1, your ROM library and saves on TF2.
  5. 5Insert TF1 and power on; the device boots into the custom firmware.
Last verified: 2026-06-20Source: anbernic.com

The RG35XX H runs on the Allwinner H700, so it is supported by the main H700 custom firmwares: muOS (fast, hotkey-driven, RetroArch-centric), Knulli (a Batocera fork with an EmulationStation front-end and scraping), ROCKNIX (a JELOS-derived EmulationStation OS), Batocera, and the minimalist MinUI. GarlicOS for this family is still alpha. Each CFW lives on its own microSD card, so flash one image, boot from it, and swap cards to try another without touching your games card. A two-card setup (CFW on TF1, ROMs/saves on TF2) makes updates painless since updating usually means re-flashing TF1.

FAQ

Which custom firmware is best for the RG35XX H?
muOS is fastest and most minimal; Knulli and ROCKNIX use EmulationStation with box-art scraping; MinUI is the simplest. All are built for the H700 — try them on separate cards.
Does installing CFW void the warranty or replace stock OS?
No. CFW lives on its own microSD. Keep the stock OS card aside and you can return to it any time by swapping cards.
Is GarlicOS available for the RG35XX H?
Only in an early alpha for the H700 family, with limited system support. For a stable daily driver, use muOS or Knulli.

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