Update
Hello, I updated the theme today and most of my JavaScript code I added is not working and I lost some of my CSS files. Is there any way I can fix the problem even if I have to restore the previous version theme. I believe the problem has something to do with jQuery version. Let me know if you update jQuery with the new theme version or if there is anyway I get my code to work again.
Thank you.
Comments
If you're customizing Theme Files, then remember to use a Child Theme.
All of your customizations will not be removed if you will use it:
https://codex.wordpress.org/Child_Themes
We use the same version of jQuery as Wordpress uses, so we will not be able to change the version of jQuery until WP change it.
Also, we can do nothing about your loss, please ask
your hosting provider, maybe he has some backups.
Thanks