STM32F405RGT6, ICM20602, BFOSD, SD Card Slot, VCP+5x UARTs, 6x PWM / DShot outputs
Tips: Pull out the plastic locking bar carefully so as not to break it.
Update your XSR with latest firmware.
Press & hold the boot button & connect the USB to your computer.
Then release the button, the FC will enter the Boot Mode.