Help tl09 keeps restarting after marshmallow b511

Hi mates, I did a rollback to B326 and then updated to B511. The update was very fast (less than 10 seconds) and the phone restarted as usual. But it rerestarted over and over and I juste don't know what to do. I didn't à factory reste but it didn't work.
If anyone could help me it would be greaat ! Thank you :)
PS: I'm a newbie si please use comprehensible words or just explain :D

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