I tried flashing under TWRP and CWRK.
Install TWRP 18.104.22.168 from here
Check MD5 on the download.
fastboot flash recovery openrecovery-twrp-22.214.171.124-m7.img
fastboot erase cache
Enter recovery back up rom
When you exit, TWRP will ask if you want to root..
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Hey thanks again for the fast respond.. keep in mind im total noob and yes i know i should not play with what i dont understand..
What i need to check with md5 program you posted me? And after installing openrecovery i still cant make back up because says "cant mount cache" and i cant mount it manually as well. Still there is a error message "no device detected"