Fri Apr 05, 2019 10:20 am
If the power+volumeup is to get into recovery, then was it per+volumedown to get into bootloader? I think but I don't remember. Anyway, if it was recovery you were trying to get into, and that doesn't work, the only other option you have is bootloader. Then, you'll need "SP Flash Tool" and a copy of the official ROM so you can manually write the system to the phone. I'm sorry I don't have the links for either but I've seen them posted in these forums.
I don't know if manually flashing your ROM voids warranty, though, but it could save you the trip months round trip of the phone going back to the seller for repair/replacement.