I mentioned this post in my first post

I tried wit and without battery.

@terziyski Thank you. I saw this thread but i couldn't find anything related to M7650 (except one question without an answer). Shiuld I just try with firmware from M7350?

After inserting sim card into the M7650 and connecting to mobile app, I got an information about firmware update. I did it from the mobile application. After the update I can't turn it on. It is...