See here: FP4 booting issues running/updating IodeOs - #5 by HereWeAre
Since the appearance of this to the finaly blackscreen where more than one Update on A13 Iode.
So in my case it was Iode OS. But others have the same issue when have/had installed an other OS, even if they’re back on StockRom.
At this point I would support the opinion of @USB-2: