Thanks, so far it worked for me (unless I lost the most updated bookmarks of my other computer now... which I haven't checked yet).
Just a few comments:
I found the backup in a different root than you stated, I think you forgot to mention "Application":
C:\Users\\AppData\Local\Maxthon\Application\User Data\Default\Backups
Also, maybe add an step 8 to restart the browser, as that proved to be necessary to me