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Go Back   GSM-Forum > GSM & CDMA Phones / Tablets Software & Hardware Area > Sony Ericsson > Sony Android based phones

Sony Android based phones General SONY Android based phones discussion, firmwares, solution, root, help

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Old 12-29-2021, 10:41   #1 (permalink)
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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.
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Old 01-02-2022, 18:06   #2 (permalink)
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where is the problem ? flash with xperia companion
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Old 01-03-2022, 12:23   #3 (permalink)
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In downgrade. How I can downgrade firmware with Xperia Companion?
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Old 01-07-2022, 18:42   #4 (permalink)
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no downgrade. and what do you want to do that for?
downgrade for what reason?
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Old 01-10-2022, 14:38   #5 (permalink)
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On Android 11 phone doesn't have network connection.
On 10 was working perfect.
This is reason for i look downgrade.
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Old 01-10-2022, 14:38   #6 (permalink)
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On Android 11 phone doesn't have network connection.
On 10 was working perfect.
This is reason for i look downgrade.
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Old 01-10-2022, 21:06   #7 (permalink)
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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
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