Game Bub firmware v1.0.1 update

What you’re building

Game Bub firmware v1.0.1 is the first bugfix release for the horizontal mass-production handheld. It fixes SRAM faults on some units, long-filename crashes, unwanted power-on behavior, GB/GBC display artifacts and 8 KB EEPROM saving for emulated GBA cartridges. The official update path uses the handheld’s UF2 bootloader: start fully powered off, enter update mode with Volume- and Power, mount the GAME BUB USB drive, copy the release UF2 and confirm the version under Settings → About after the automatic restart. The v1.0.1 download is explicitly named for revision 4; the archived v0.1 release instead identifies its bitstreams as revision 2 files. Finish or save any running game before powering down, keep the device connected during the copy, and use a data-capable cable.

Key steps

1. Finish or save the current game, download gamebub-rev4_v1.0.1.uf2 from the official release, and confirm that the target is the horizontal mass-production revision 4 handheld named by the asset.
2. Power the handheld off, wait 10 seconds, then hold Volume- while pressing Power; expect the purple light to blink twice at a time while the screen remains off.
3. Connect the handheld to the computer with a data-capable USB-C cable and wait for the GAME BUB virtual drive to appear.
4. Copy the v1.0.1 UF2 file to GAME BUB, keep the cable connected for up to 30 seconds, and wait for the handheld to restart automatically.
5. Open Settings → About and confirm firmware v1.0.1. If Windows reports a failed copy and the handheld does not restart, reconnect it in update mode and repeat the documented copy step.