Hi I'm having trouble with this aswell. I got the same errors, so I followed the instructions and deleted unused tickets. I even powered off and on console. But when I go to eShop and exit it for any reason.The SAME unused red tickets reappear!!
And also, I only noticed this update error for full game revisions only. For eg: Mario 3d Land, Kid Tripp. But NOT for Kirby Battle Royale which has a seperate 'Update Data' on eShop. It updated from eShop automatically when I went to eShop > Settings > Available Updates and it said update available for Kirby Battle Royale, so I Click on "Update" and it downloaded and updated it. But for Mario 3D land, there is no separate Update available. For eg: Update Data V1.xx like there is for Kirby Battle Royale. So as I already installed the cia (not legit) of Super Mario 3D Land, when I go to the Super Mario 3D Land on eShop it says Update, when I click Update it shows the error code 007-2920. Please help!
I'm using the same region CIA. But I have to clear something, would FULL game updates work via eShop or only "Update Date" ones? If both should work, please help me with 3D Mario Land!