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Please read this if you considering unlocking the boot loader or rooting your phone.
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 http://unlockbootloader.sonymobile.com/
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.
Sony Xperia support team
2018-04-10 02:04 PM
if you are reading this, please pin this, its really easy to do and it will work on other 2028 xperias(if people use twrp for their phone)
2018-06-26 05:36 PM
all work fine untill fastboot boot twrp-3.2.1-0-pioneer.img then i get always waiting for any devices
2018-06-26 08:39 PM
I guess your computer doesn't have fastboot drivers they are different from just phone drivers
Search up a lil bit and you will be fine.
2018-08-11 12:05 AM
Is there a known way of doing this without unlocking the bootloader as according to my model (H3113) Bootloader Unlock: No
2018-10-21 09:53 PM
I tryed to install lineage os on my sony xperia xa2.
when i make on ubuntu in root:
fastboot boot /home/wehrli/twrp-3.2.3-1-pioneer.img
OKAY [ 2.209s]
FAILED (remote: Command not allowed)
finished. total time: 2.210s