: For wireless controllers, disconnecting and reconnecting the internal battery (if comfortable opening the device) has been reported to force a proper reboot. Firmware Re-flash
If the standard updater doesn't recognize the device in UBOOT mode, email the manufacturer. They often provide a standalone .exe and .bin file specifically designed to flash devices stuck in the BR23 state. br23uboot1.00
Some users warned that the firmware repair software provided by manufacturers (like GameSir) was flagged as a trojan by antivirus software, making them hesitant to use the "solid" fix. How to Fix It : For wireless controllers