If after a hardware change and you encounter Error Code 0x803FABB8, Donor hardware ID does not own operating system entitlement, see this fix.

Struck by an error or a bug in Marvel Rivals? Check out our guide to help you fix many Error Codes, bugs, and other issues in the game.

But what exactly causes it, and most importantly, what do you do in order to fix it? If you follow this easy guide, you can say goodbye to that pesky code and surf error-free.