is not a consumer product you can buy, but rather a firmware bootloader state that appears when certain gaming controllers—most notably the 8BitDo Ultimate Bluetooth , GameSir G7 , and some generic DualShock 4 clones—fail or enter a recovery mode.
If your controller is showing up as BR23UBOOT1.00, it is usually because: br23uboot1.00
Physical button combos held during plug-in that force bootloader mode. The "Review" Experience Performance in "BR23UBOOT1.00" Mode Connectivity BR23UBOOT1
A stuck button or a short circuit during power-on might have triggered the manual "bootloader" entry. br23uboot1.00