The stroke of genius comes from @topjohnwu. I only use the potential of this powerful Android tool.
@VinK3645 it’s like in school: you don’t learn anything by copying. Trying things out yourself improves your own knowledge and you don’t have to rely on others.
In the meantime, I’ve removed @ronnz98’s /e/OS-U 2.9 on my Samsung Galaxy S7(herolte) and installed further builds/e/OS-S official-herolte starting from /e/OS-S e-2.4.1-s-20241008439849-official-herolte.
Murena MDM App v6.03 (not activated) is implemented in /e/OS-S from version e-2.6.3-s-20241217455357-official-herolte.
The Murena MDM app is not displayed under > All apps (25 apps installed), but can be found with “Search setting”.
In e-2.9-s-20250321478216-official-herolte, as in /e/OS-U 2.9, I’ve subsequently installed MagisK without data loss, bootloop or other malfunctions. Then used the De-Bloater app (with root rights) to eliminate the unwanted Murena MDM app.
Last but not least, Magisk was instructed to uninstall itself again without leaving any residue. Thought - done. Now e-2.9-s-20250321478216-official-herolte runs flawlessly without Murena MDM.
If you don’t believe it but still want to know - try it out for yourself. Now!