You solder three wires (TX, RX, GND) to a BR23-based device. Upon power-up, your terminal shows:
For GameSir users, this mode is the starting point for a . My Gamesir G7 is being recognized as BR23UBOOT1.00
br23uboot1.00> loady 0x80000000 ## Ready for binary (ymodem) download to 0x80000000... # Transfer custom_firmware.bin br23uboot1.00> sf erase 0x20000 0x300000 br23uboot1.00> sf write 0x80000000 0x20000 0x300000
In the context of 1.00 , uboot probably indicates: