WHAT IS THIS ????????

BATTERY FAILED

That’s how it looks like in the middle of a firmware update.
I would try updating it again, with the go app or assistant 2 - whatever that works.
Unfortunately update will abort when the battery gets below 50%.
So I would hurry trying it. I’m not sure it will charge in this state.

I won!!! I reset to fabric my spark and then i recovered this battery... i m happy