nand dump doesn't help.
IOS dump does, but you probably didn't dump all your IOS one by one using bluedump.
I have the same issue with syscheck on Wii (it crashes when I hit A to display the result).
it could be related to bad or missing IOS (I don't have IOS56 as I'm on 3.2E, don't know if it's an issue).
Saying you have issue to connect to eshop and that you have the crash issue than me (not having IOS56) make me think your issue is releated to that IOS. (that eshop require)
If you made proper vWii IOS dump like asked in
tutorials, use a Wad manager to reinstall IOS56.
If you don't have a proper signed IOS56 dump, tell us. and DO NOT TRY ANYTHING until we tells you it's safe.