I first dumped my EU account according to your instructions.
Then I entered JP account, activated it, dumped it. Games work.
I loaded my EU account, restarted and no game worked when I start one:
First screen:
An error has occured. (NP-6174-8)
Second screen:
Could not prepare the application to start.
I loaded my JP account again, restarted vita, games work.
So I thought something is wrong with my EU account dump.
I did all the SD unslave / reset this device stuff again and made a clean EU dump. Games worked again.
Then I loaded my JP account again, restart and now I have the same error messages (see above) on my japanese games. What's wrong?!
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