As the title said, I've closed all service ports by mistake on my SXTsq Lite5, so I've no longer have access to it to configure it. Is there any way to regain access - maybe throught serial port - in order to not to losse all the configuration by doing a factory reset?

Thanks!

Yes, and there are no way to save config as disabled services are part of configuration.
https://wiki.mikrotik.com/wiki/Manual:Netinstall

Hopefully you have previously saved backups so after the net install, you can restore from your backup. If not, lesson learned - backup, backup, and off site backup.



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This!

If you've only disabled the services listed under IP > Services, you should still be able to connect via MAC telnet and MAC winbox.

Thank you! You save my day!