Before you ask, yes I've searched Google and yes I've looked at similar posts. A specific one (that I can't link bc my account is too young) had a solution that I tried but I'm still getting the error. Basically I'm trying to update Shovel Knight Treasure Trove so I can have the King of Cards DLC. I backed up a CIA from the cartridge (which I lost a few months ago) and I installed that cia to the 3DS. I used freeShop to update the game, since using the regular eShop to update didn't seem to work. I deleted all unused tickets as someone said in that post but I'm still getting the error.