I failed to upgrade Moodle from 3.6 to 4.3. I think it is because many core files have been customized in my Moodle version.
Is it possible to find exactly Moodle 3.6.1 https://moodledev.io/general/releases/3.6/3.6.1
$release = '3.6.1 (Build: 20181205)'; // Human-friendly version name
I want to compare my version with official to identify what has been changed.
On Moodle GitHub unfortunately another release https://github.com/moodle/moodle/blob/MOODLE_36_STABLE/version.php
$release = '3.6.10 (Build: 20200511)'; // Human-friendly version name