Re: NFS Unbound Error Code 6 & Error Code 9: "Unable to save file"
Return to the game menu, then go back to the PS Home, exit the game, and restart. I repeated this process three times, or alternatively, waiting for about a minute might resolve the issue with a single restart.
I speculate that the errors occurred because, after customizing the car, I exited the game directly from the PS5 Home without returning to the game menu. These errors occurred upon the next startup. Therefore, I now make it a practice to return to the main menu before exiting the game.
Similar issues occurred in the past ("I can't remove my car wrap. It's displayed as equipped."), and I resolved them by avoiding synchronization of PS5 save data with cloud storage.
If these steps don't bring a resolution, it's possible that the situation remains challenging. I understand that you might be experiencing deep sadness, and that saddens me as well.
Finally, I have a suggestion for community administrators. Adding a link to examples of Technical Issues posts in bug reports could be beneficial. I, playing on PS5, overlooked Technical Issues, assuming it was for PC users. Alternatively, I hope this post is approved as a solution similar to previous instances. Sharing this information as this problem recurs in bug report posts. I would be pleased if it proves helpful to someone.