I've been searching Google for years and I could not find any decent solutions.
I have blocked Sony Z3 Compact [D5803] and I need to install TWRP and make a backup of the current operating system.
I can use flashtool to install custom files that have been downloaded from xperiFirm but it seems an impossible mission to root it after 🙂
I was also trying this article here:
… Without any success.