"Safety" when playing with Zenfone 2?

Hi, I have just send my Z008 to service center in status of very hard bricked because I downgraded from MM beta to LP. And when I get it back, I will play with it again with less sanguinary. Before that I played very much with it like rooting, unlocking, TWRP-ing, CM-ing,... And now I would like to know how dangerous it is and how many percent of chance I could ACTUALLY HARD brick my phone? (Bootloop, lost of OS, wrong serial number is not thing; and usb cable is a bit confusing). Can you guys help me? Thanks

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