Launch the proprietary application, such as the GameSir Nexus app or Gamesir T4k app, to see if a prompt appears to automatically fix or initialize the firmware.
Use a pin to hold the reset button down for 10–20 seconds while the controller is plugged in.
If a wireless dongle or the controller itself is stuck in the BR23UBOOT1.00 state, it is actively waiting for a direct firmware image injection. br23uboot1.00
A stuck button or a short circuit during power-on might have triggered the manual "bootloader" entry.
In some cases, the issue may be exacerbated by Windows automatically loading an incorrect driver for the device in bootloader mode. Even after fixing the controller itself, you may need to clear Windows' driver cache. Launch the proprietary application, such as the GameSir
If your controller is new, it is highly recommended to reach out for a warranty replacement if a firmware re-flash does not work. Are you experiencing this on a GameSir G7
Reconnect the controller directly to a primary USB port on your PC to check if it powers on normally. Method 2: Trigger a Force-Update Using Brand Software A stuck button or a short circuit during
A: No. In bootloader mode, the chip's main application—including Bluetooth functionality—is not running. You cannot pair or connect via Bluetooth until the controller is recovered.
: This represents the micro-architecture series of the Jieli processor family (the successor to the older BR17 and BR20 chip lineages).
: A configuration file used by the Jieli download tool ( isd_download.exe ) to stitch the bootloader and app binaries together into a single flashable file. Reverse Engineering and Firmware Hacking
Most users encounter this when their 2.4GHz dongle or controller suddenly stops connecting and shows this name in Windows Device Manager instead.