GSM-Forum - View Single Post - Sony XPERIA 1 II XQ-AT51 downgrade?

adigvip · 12-29-2021, 10:41

Hello,
I have Xperia 1 II with firmware 58.1.A.5.507 and on this FW phone doesn't have network.
About 1 month ago I was downgrade phone (I don't remeber FW inside phone) to firmware 58.1.A.5.474-R25B and network comeback - solution from other forum.
But customer again make accident update and phone lost network again

Now when I flash lower FW phone, I have message "Your device is corrupt. It can't be trusted and will not boot. Your device will be powered off in 5 seconds.".
Anybody have solution for downgrade this phone, or repair network?
Best Regards, Adrian.

12-29-2021, 10:41	#1 (permalink)
adigvip Junior Member Join Date: Feb 2007 Posts: 14 Member: 456260 Status: Offline Thanks Meter: 3	Sony XPERIA 1 II XQ-AT51 downgrade? Hello, I have Xperia 1 II with firmware 58.1.A.5.507 and on this FW phone doesn't have network. About 1 month ago I was downgrade phone (I don't remeber FW inside phone) to firmware 58.1.A.5.474-R25B and network comeback - solution from other forum. But customer again make accident update and phone lost network again Now when I flash lower FW phone, I have message "Your device is corrupt. It can't be trusted and will not boot. Your device will be powered off in 5 seconds.". Anybody have solution for downgrade this phone, or repair network? Best Regards, Adrian.