Blockchain.com old wallet fails to upgrade to HD – what to do?

Blockchain.com old wallet fails to upgrade to HD – what to do?

I have an old Blockchain.com wallet which I could not access all the years because I didn’t know the 2nd password required.
No w I have it but get the error message „Failed to upgrade to HD and save wallet“.
Is there any way to do it on my own? with a python library or such?
Thanks.