RetroCompass
RetroCompass

GKD Bubble — Custom firmware

Quick answer

Button combo

(power off)(power off)write CFW image to microSD/TF

Steps

  1. 1Confirm the chip: the GKD Bubble is Rockchip RK3566, so use RK3566 firmware. ArkOS is RK3326-only and does NOT support it.
  2. 2Choose ROCKNIX, Batocera, or Knulli and download their RK3566 (or device-specific) image.
  3. 3Write the image to a microSD/TF with balenaEtcher.
  4. 4With a generic RK3566 build, apply the Bubble notes/profile so the screen, controls, and HDMI behave.
  5. 5Insert the card, power on, and finish setup.
Last verified: 2026-06-20Source: game-kiddy.com

Pick CFW by chip. The Bubble is RK3566, so ROCKNIX, Batocera, and Knulli are the relevant options, usually via the generic RK3566 image; its stock OS is often plumOS. ArkOS targets RK3326 and is NOT compatible, and muOS is Allwinner-only. Support varies by build, so confirm the Bubble works with your chosen image and keep your stock card.

FAQ

Can I use ArkOS?
No. ArkOS is RK3326-only. The Bubble is RK3566, so use ROCKNIX, Batocera, or Knulli instead.
Will HDMI output work on CFW?
It depends on the build. Use an RK3566 image that supports the Bubble's hardware; some features may need a device-specific profile.

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