So i found something i guess maybe:
When im opening the old “Settings”-App (which was my magisk) it says: “Magisk-App wiederherstellen. App kann im versteckten Zustand nicht weiter funktionierne, da Root verloren gegangen ist. Ursprüngliche APK bitte wiederherstellen.” When i try to press install it tries to install the apk which fails (i guess since i already updatex to the new magisk version). Maybe its an option to deinstall magisk manager AND the “Settings”-App and reinstall the newest version of magsik-manager as recommended here: 2 Solutions! Problem w/ MagiskHide being disabled after reboot/closing MagiskManager. | XDA Forums.
When i run su in termux on my regular os it says su ist not installed, but when i open it on the patched version i can grant superuser permission
When i now pressed magisk (while running the patched version), it was hidden again, but i could open it via (hidden) Settings app. I chose “magisk app wiederherstellen”. The app now shows that im on version 25.2.
i disabled universal safety net, and installed magisk to slot a (after OTA). after that i still get bootloops.
i then went back on my common os (slot b). Settings app was not visible anymore. I updated to version magisk manager to magisk 26.1.
I booted back on the patched img via fastboot, here magisk app is on 26.1 and it says magisk is installed on 25.2, it gives me the option to Update to second slot after OTA.
Still gettin bootloops.
next i first disabled and second time removed universal safety net. still gettin bootloops.
Then i tried to disable zygisk. it says new start is necessary so changes take effects.
After a new start zygisk (with fastboot into the patched img) is disabled. I tried another patch after OTA. Still bootloops.
After another boot to the patched os, magisk says Dein Gerät benötigt ein Reflash von Magisk, um richtig zu funktionieren. Bitte Magisk innerhalb der App neu installieren, der Widerherstellungsmodus kann keine korrekten Geräteinformationen abrufen.
I then activated Zygsik again, deactived denylist, and then deactivated Zygysk, installed with OTA. Still bootloops.
I then activated Zygsik and denylist, then unchecked every app from the denylist and deactives both again, installed OTA. still bootloops.
after another installed to second slot-> bootloops
Is there a risk of deinstalling the magisk manager app and reinstalling it and then trying it again?
If this doesnt help, whats the best way to get a working system on my slot a?