I think you're right. The more I think about it, and then since googled how to deleted the game and player settings, I see many hits about other legit players having save issues on all platforms. This leads me to the conclusion that the game wants to be synced online.
Installing uncharted 4...
I came to the same conclusion yesterday with some help on discord after several days of dumping and manually decrypting using ftp.
The problem I was having was only with the 1.33 update for uncharted 4 and the 1.11 update on mortal Kombat 11. I renamed and swapped the trophy file from FTP and...
Thanks. This system has never been online since 2.x and I've already used this tool early in its release to change my icon to this cassette. The space invader icon for my son looks great too.
One update possible, could be the option to reinstall same OFW to add exfat support on current FW. I'm nearly certain I did that on an earlier firmware using this app, but somewhere along the way, a FW update broke? the functionality. I use fat32 now, but I installed atmosphere for a friend...
I don't think you can unlink your Nintendo account without updating. Not from the research I've done anyway.... I would love to be wrong because I want to unlink mine on my 4.1 and leave my 2.1 second switch in the box for now. I don't care at all for online...