Hello,
i recently acquired a Sony Xperia Z3 Compact from a guy, the phone was unused (only open box) with all accessories. Two ago i wanted to start using it so i connected my Gmail account. Everything was fine until i take a photo. Phone was not responding for about one second then rebooted. After it displays Sony logo, it keeps rebooting.
A small video about it can be found here
I tried all recommandations from this link https://support.sonymobile.com/global-en/xperiaz3compact/faq/system-&-performance/i-cannot-power-on-... without success.
While it keeps restarting, if i connect it to PC i'll have this : 
I do not understand it because there were not security on it. Then i tried to repair it
After repairing with Xperia Companion, the bootloop still continue. I don't know what to do now please if someone can help.