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Sony XPERIA 1 II – Android 11 – 58.1.A.0.921

First of all one important thing – before you start to do anything with your phone, do the backup of your personal data. It is only for your safety in case that something goes wrong or any mistake happens. In that case you can use the backup to restore the data and try to do everything once again. Each tutorial has been done many times to verify its propriety, so just read carefully all instructions and continue step by step. Our tutorials will be of course updated every time when Sony Mobile publishes anything new, affecting any of our topics. The major part of every file has been created by myself and every file has been tested on the corresponding phone. All referenced files are determined for Sony XPERIA 1 II.

How to Install Android 10 | Android 11 for Sony XPERIA 1 II
a) download and install latest Flashtool
b1) download Android 10 for Sony XPERIA 1 II XQ-AT51 (firmware 58.0.A.3.194)
b2) download Android 10 for Sony XPERIA 1 II XQ-AT52 (firmware 58.0.A.3.224)
b3) download Android 11 for Sony XPERIA 1 II XQ-AT51 (firmware 58.1.A.0.921)
b4) download Android 11 for Sony XPERIA 1 II XQ-AT52 (firmware 58.1.A.0.921)
c) open the XPERIA Flashtool, click on flash and choose firmware, than click ok.

Important – if you do not want to delete any data of your phone, just uncheck flashing userdata.sin file. All data will remain in your phone, but sometimes it can cause additional troubles. So it is better (and I recommend that) to do the backup of your personal data, than proceed with clean instalation and then restore your personal data.

d) turn off your phone and when Flashtool shows pop up window, connect phone to PC with holding volume down button
e) after few minutes all is done and your phone gets new firmware

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