There is no corruption in wallets (95% of them are like that). They work in original client I was able to run. Thanks for the tips, I will try them out today

Hey.
I had Electrum installed on my linux, but it stopped running there. I just copied the Wallet folder, but i get this strange errors with most of the wallets: (just few work, smaller in size - large wallets don't work)
"Cannot read wallet (1):
'utf-8' codec can't decode byte 0xe1 in position 0:
invalid configuration type'

I previously tried moving wallets to another linux machine but it also could not read the files (and they were working at the same time on the original machine)
Now I am trying to do this under windows 10, but the situation is critical, because electrum stopped working on the original machine.

The version of the original Electrum was 2.8.2

I have backup keys most of wallets
When I try to import to 2.8.2 it works.
When I try to import to 3.2.2 it doesnt let me click next (using master key)

What is wrong with this new electrum, that it does not accept its own backup keys?