How to go back to stock firmware?

How do I uninstall the Hive Firmware?
All my other ASIC miners just connect to whatever pool on their stock firmware but, I cant seem to get Hive to connect this s9i. I am confused by so many options and I dont’t have the time.

I want to go back to stock firmware but I just get a system upgrade failed when I try

Just Flashed with Bitmain SD Card Recovery image FW …

Can you tell me what is the process to do this?