Thread: Sony XPERIA 1 II XQ-AT51 downgrade?
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Old 01-10-2022, 21:06   #7 (permalink)
the_laser
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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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