Its only compatible with Antminer S9i right now, someone said there was a file you can edit somewhere in the thread to get it to write to a regular S9 (i think ?)
Yeah you can edit the control file located in the firmware folder. The item is on line 1: FW_MINER_HWVER="Antminer S9i". Got a spare control board lying around so gonna test the edit
EDIT: So yeah, don't edit the file. Chances are it will brick the vanilla s9. Can't understand why it does that if using the SD card works but oh well.