Thanks for the information!
Now i have unlocked bootloader, installed TWRP and backed up the Stock ROM. Now i run the ZIP Viper10_5.9.0.zip. I have two pictures with some choices here i wonder about.
FULL_WIPE_IMAGE_IMAG3671.jpg: I think i should choose "Full Wipe". That is right? I don't have any personal data or similar on the phone.
SU_ALTERNATIVES_IMAG3672.jpg: How about the SU-concept option? Should i choose "Magisk & MagiskSU" or "Magisk & SuperSU" or maybe "SuperSU only". I heard someone said the default for Viper10_5.9.0.zip would be non-Magisk, therefore there is a Viper10_5.9.0_MAGISK.zip for users that want the Magisk.
But now the AromaInstaller says "Please select the config you want to use. If you don't know what option to pick, use the default selection", i thought the default for this Viper10_5.9.0.zip would be non-Magisk. I heard that that Magisk "has a few minor disadvantages" like "not all hub add-ons are compatible with the magisk ROM.". So my thought was that i might go for something other than Magisk.
If i choose "Magisk & Magisk SU", will i be able to receive OTA updates then?
But now I'm a bit confused. I might have missed some concepts.