Mh, after reading instructions again and again I found the problem. You can either call me stupid or one can think that instructions can have a slight improvement.Coming from unrooted stock I think I followed the instruction (used Magisk 22.0) . But after loading firmware with Odin (patched AP and others) - I am in a bootloop. See this part of instruction:
But while in bootloop there is no question about wipe data! How to get out of this hell?
- After Odin is done, your device should reboot. You may continue with standard initial setup.
If you are stuck in a bootloop, agree to do a factory reset if promted.
The only I get is back to download mode but there is question "Lock bootloader + factory reset" or "Don't lock and restart". Finally I go to "Recovery Mode" and did factory reset there to get out of bootloop. After a while Android starts. Magisk is away (because of factory reset). But after installing Magisk again it reports to have no RD installed. ?!?