Sony XPERIA 1 II XQ-AT51 downgrade? - GSM-Forum

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.

serpas007 · 01-02-2022, 18:06

where is the problem ? flash with xperia companion

adigvip · 01-03-2022, 12:23

In downgrade. How I can downgrade firmware with Xperia Companion?

serpas007 · 01-07-2022, 18:42

no downgrade. and what do you want to do that for?
downgrade for what reason?

adigvip · 01-10-2022, 14:38

On Android 11 phone doesn't have network connection.
On 10 was working perfect.
This is reason for i look downgrade.

adigvip · 01-10-2022, 14:38

On Android 11 phone doesn't have network connection.
On 10 was working perfect.
This is reason for i look downgrade.

the_laser · 01-10-2022, 21:06

you need to perform "MLR unlock" service in order to downgrade firmware on any Sony phone after Xperia 1, Xperia 5 ( Xperia 1 II, Xperia 1 III, Xperia 5 III, Xperia Pro I, etc )

it is quite costly, though.

search for qUnlockTool

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.

01-02-2022, 18:06	#2 (permalink)
serpas007 Freak Poster Join Date: Jan 2008 Location: HH +4940 Posts: 306 Member: 686560 Status: Offline Thanks Meter: 68	where is the problem ? flash with xperia companion

01-03-2022, 12:23	#3 (permalink)
adigvip Junior Member Join Date: Feb 2007 Posts: 14 Member: 456260 Status: Offline Thanks Meter: 3	In downgrade. How I can downgrade firmware with Xperia Companion?

01-07-2022, 18:42	#4 (permalink)
serpas007 Freak Poster Join Date: Jan 2008 Location: HH +4940 Posts: 306 Member: 686560 Status: Offline Thanks Meter: 68	no downgrade. and what do you want to do that for? downgrade for what reason?

01-10-2022, 14:38	#5 (permalink)
adigvip Junior Member Join Date: Feb 2007 Posts: 14 Member: 456260 Status: Offline Thanks Meter: 3	On Android 11 phone doesn't have network connection. On 10 was working perfect. This is reason for i look downgrade.

01-10-2022, 14:38	#6 (permalink)
adigvip Junior Member Join Date: Feb 2007 Posts: 14 Member: 456260 Status: Offline Thanks Meter: 3	On Android 11 phone doesn't have network connection. On 10 was working perfect. This is reason for i look downgrade.

01-10-2022, 21:06	#7 (permalink)
the_laser No Life Poster Join Date: Feb 2002 Location: Russia Age: 44 Posts: 2,681 Member: 9519 Status: Offline Thanks Meter: 2,150	you need to perform "MLR unlock" service in order to downgrade firmware on any Sony phone after Xperia 1, Xperia 5 ( Xperia 1 II, Xperia 1 III, Xperia 5 III, Xperia Pro I, etc ) it is quite costly, though. search for qUnlockTool