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Please read this if you considering unlocking the boot loader or rooting your phone.

Important information

Please note that you may void the warranty of your phone and/or any warranty from your operator if you unlock the boot loader. You should only unlock the boot loader of your phone if you are an advanced user with good knowledge of the technology and risks involved.

For more information go here

Please also note

The Sony Xperia support team will not be able provide any support, related to unlocking the boot loader or rooting your phone.

We also recommend you to read the below blogposts.

Best regards
Sony Xperia support team

Z5 Compact flash ROM generic from 7.0 to 5.1.1

One time poster
Message 1 of 1
Message 1 of 1

Z5 Compact flash ROM generic from 7.0 to 5.1.1

Hello, I have made very big mistake from updating from 5.1.1 to newer Androids like 6.0.1 or 7.0.(Mainly 7.0). I yesterday got notificafion that I got to update to 7.1.1 but as I seen the negative reviews about bigger problems than 7.0, so I won't update. But I want to downgrade from 7.0 back to stock 5.1.1 because this battery drain is unacceptable! Problem is that I'm from Slovakia and I have no idea what firmware version my device have is it Central Europe? I also would like to get info how to unlock Bootloader and then flashing. Thank You very much. 


Edit: If my Firmware version is Central Europe could I use this one? -