Unlike more premium keyboards that use an ATmega32U4 (common on Pro Micros) or an ARM STM32 chip, the RKPX3 is a with integrated Bluetooth capabilities. It is a cost-effective solution for manufacturers, but it presents a unique challenge for enthusiasts: It does not natively run QMK.
Always triple-check your PCB version, use a Linux live USB for more reliable flashing tools, and have an SWD debugger ready. The RKPX3 can be liberated, but it demands respect for the low-level realities of embedded systems. Last updated: 2026-04-16. Always refer to the latest QMK documentation and your keyboard’s specific community thread before flashing. rkpx3 mcu update
sonix-flasher -w openrgb_bootloader.bin This replaces the factory bootloader. After a successful write, the keyboard will disconnect and reconnect as a new device – typically an (even though it’s an RKPX3, the emulated DFU is used for QMK). Phase 4: Flashing QMK/Vial Firmware Once the open bootloader is in place, standard QMK tooling works: Unlike more premium keyboards that use an ATmega32U4