bought a banned system?

[lordzelix]

last week i bought a used computer for a good price,
installed everything launched up my game, and got banned 
contacted the guy asking if he ever cheated on the system and said yes but he told me that the serials are spoofed and you can revert it with bios flash and clean install
which i did after watching some videos, but it didnt change anything after trying to talk with the guy again he blocked me/removed his profile

now i'm stuck with his mess is there a way i can fix this somehow?

it's a asus z390 prime motherboard

 

DMI:
			DMI BIOS Vendor	382914fb6141c33
			DMI BIOS Version	7b5e7fde6ac11b4
			DMI System Manufacturer	6e8bad522ce36a3
			DMI System Product	44e879178694ad8
			DMI System Version	529d36e01805e9d
			DMI System Serial Number	[ TRIAL VERSION ]
			DMI System UUID	[ TRIAL VERSION ]
			DMI Motherboard Manufacturer	89ad996fc8616cf
			DMI Motherboard Product	8031b389a845dfc
			DMI Motherboard Version	6e87742360a8f3f
			DMI Motherboard Serial Number	[ TRIAL VERSION ]
			DMI Chassis Manufacturer	Default string
			DMI Chassis Version	Default string
			DMI Chassis Serial Number	[ TRIAL VERSION ]
			DMI Chassis Asset Tag	[ TRIAL VERSION ]
			DMI Chassis Type	Desktop Case

 

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