1) You can download Android 6 using Xperifirm, the answer is here: https://talk.maemo.org/showpost.php?...&postcount=785, and you can download Xperifirm from XDA Forum: https://forum.xda-developers.com/cro...oader-t2834142 2) You don't need unlock the bootloader to flash the downgrade image 3) Yes, you can only flash sony image without bootloader unlocking