Howto install Calyx OS on FP4

Thx for the quick reply. Most of the stuff is clear to me now.

Just some details / double check questions:

  1. When we talk about unlock bootloader is it just the fastboot flashing unlock or also fastboot flashing unlock_critical? The last one was discussed here in some posts and it seems that also /e/OS and official Fairphone guides point on that. So do you leave this second option unlocked as well or do you lock it again (at least in between updates or so)? As far as I understood it should stay unlocked as well, at least in regards of the following two issues (correct me if it is wrong):
    ** during first installation with the factory version → to get rid of a lot of FAILED (remote: 'Flashing is not allowed for Critical Partitions')
    ** prevent problems during OTA updates

  2. The update procedure is performed within the running CalyxOS (except the reboot of course), right? (uninstall Magisk within the Magisk App; run the OTA update; install Magisk again [via inactive Slot option] ← never saw that up to now tbh - anyway.

  3. the first installation of Magisk procedure, you explained here, is still the recommended way? (with a boot from the patched boot image in between) - I didn’t get the A/B boot image point up to now, so I feel a bit unsafe and I think I will pick the boot.img from the Calyx factory zip for patching in Magisk App.

(Last point: I can edit the initial post as well (handled like a wiki post I think - and depending on the privileges some users can edit). @R2D2 do you mind when I (/we … whoever can) edit it, in case there is anything to add/re-word (first example might be 'unlock_critical`)?)
EDIT: Will eventually create a separate guide for Calyx including root and don’t touch this one…