I've had this error a few times and for me the easiest way to recover the box was by doing a reflash...the way to do this is well documented in the section...I had the box back to normal use in about an hour..good luck
PS: Just to add follow this page below carefully
ThreadFlash your Zgemma H7x using RECOVERY and/or USB filesFor super-dooper all-round and in depth support re. Zgemma and in particular H7 - look in PurE2 section: PurE2 Team
Attention: one needs a compatible USB memory stick for this to work. Smaller ones usually work better.
Let's start with explaining the 2 types of flashing files you will find:
1) RECOVERY FILE is used to repartition your flash, delete everything on it and start anew, from scratch, all 4 partitions!
So, when this file repartitions the H7 flash, it will erase all the old partitions,…
Thanks!!!