There is also a emergency update description inside the manual. ( page 46 )
http://www.team-blacksheep.com/tbs-crossfire-manual.pdf
For the micro receiver it is a little bit more complicated. As the device itself does not have a USB connecter the firmware needs to be loaded by BST for emergency update. This requires a TBS CORE PRO or a diversity receiver. Connect the micro receiver to one of those devices by BST. Press and hold the bind button of the micro receiver while powering up the TBS CORE PRO or the diversity receiver by USB. In case of the diversity receiver you need to keep pressing the bind button while powering up the micro receiver with an own power supply. The LED of the micro receiver should blink fast which indicates the receiver is in bootloader mode. Open your TBS Agent and load the latest version. Once the device connected directly to the USB is updated, the TBS Agent will update the micro receiver too.
Best regards,
