I started experiencing this same Error 544 bug a couple of days ago. I’m two main quests away from my first play through and have put over 240 hours into it. I’ve tried the troubleshooting and nothing sticks. I really wish I would’ve just gotten the game from Steam, but I had so many PlayStation credits that it was practically free. I’ve since purchased the PC version, because if I have to start all over, it won’t be on the PS5 with this amount of negligence either from Larian, Sony or both.