I know it's solved without explanations but for safety purposes:
Next time, you must not directly open a backup of the file because Electrum will try to upgrade it and if corruption occurs, you'll lose your digital backup.
It's best to copy the file and use that copy instead.
I have resolved the issue but cannot delete the post. Thanks anyway.
Please reconsider this reply by hugeblack from your previous thread:
Problem resolved, but not allowed to delete my own post.
Why do you want to delete the topic? On the contrary, it will be better for others as they will find the answer directly without asking again or searching on Google.
Generally how is your problem solved?
-snip-
