All is converted. Please check now that all seems correctly converted, browse a little the site in various movie.
I case there is some big issue in the data I can still revert back to the old database.
I'll unlock the site probably in the next hours.
Please report here any error that you notice.

First "signs" of the switch to unicode is that now special characters should be correctly displayed in links, and makes with these characters are correctly handled.
e.g. İşbora is now correctly displayed with the makes starting by "I" in https://www.imcdb.org/makes.php rather than being at the top of the list.

For users who had special non-ASCII characters in their passwords (e.g. accents), you may need to reset your password. You can put the same as the old one, but as it is not stored in the database (only a hash is stored) I can't convert these (the hash seems computed differently from a unicode string).
Once the site will be unlocked, if you encounter a problem for resetting your password, do not hesitate to contact me.