[Q] I have some question about backup TA on Z1 locked bootloader 4.3 topic

Hello to everyone on Xda! I'm a C6903 user with 4.3 on 14.2.A.1.136,
I have a problem, i want to backup TA before Unlock bootloader, but for backup i need root, there is a possible way to backup without rooting and after unlocking bootloader? :eek:

I need this for a trusted unlock! Thank's to all!!