cannot fix after changed from http to https

Hallo, I have a problem and writing here before cancelling all and restarting to build the site.
– in this case the hosting is in Hong Kong and the provider gives us .com.hk, pre installed MySql, not installed WP
– I installed WP and built the site (before made a draft offline with xampp, tested and then not uploaded but copied with a fresh installation from zero)
– the initial url, few days ago was http
– after installed 95% (all was working very well) I complained that they were not providing the ssl dv certificate
– normally (in other cases) the ssl dv is installed by myself: in this case they installed the ssl cert for us “while the machine was already running”
– I started to modify all but unfortunately I was forced (due to other problems) to clean the internet temporary files from my chrome
– obviously suddenly all disappeared: 404 error /wp-admin not found, etc
– the other problem is that I had (active) a plugin for “maintenance mode”, so must in any case enter as admin to deactivate it
– tried modifying the .htaccess and the wp-config, but with zero result, because if I don’t enter as admin to change the url (settings / general) inside it still says “http”
– tried to modify from database, changing the url in wp-options (from http to https), but zero results
– with filezilla, via ftp I see all the structure, but it does not work
– initially it was possible to go to https://www.biomotive.com.hk and see the “maintenance mode page”: now after several trials worst in worst the result is “internal server error”, or “404” or … every change I try I revert back to initial http status to avoid to complicate the situation
I tried to change the files permissions to 755 but nothing
I also applied what explained in the following two memo:
https://websitesetup.org/http-to-https-wordpress/
https://www.wpbeginner.com/wp-tutorials/how-to-add-ssl-and-https-in-wordpress/

but nothing: the problem is that cannot access to wp-admin (wp-login) anymore

it seems the only option I have is to cancel all and restart to build my website again.
Any option? thank you

• This topic was modified 5 years, 4 months ago by Mauro Vicariotto.