Recovering Bricked (Unbootable) Devices Using SD Card
If anything goes wrong and your device seems unbootable, you can use the previously created SD card image to recover original firmware from the manufacturer:
Follow the steps in Creating Bootable SD Card Image to boot the device
Run (on Windows, use python command instead of python3):
cd braiins-os_am1-s9_ssh_VERSION
python3 restore2factory.py backup/2ce9c4aab53c-2018-09-19/ your-miner-hostname-or-ip