Official instructions don't say that you need to get vbmeta.img

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Oct 12, 2015
HTC One (m7)
I followed the official instructions you can find here.
My device has a boot ramdisk so I grabbed the boot.img as requested by the instructions. I also checked if it has a separate vbmeta partition and it does.
I followed all steps in section "Patching Images", but when I get to the line saying
  • (Optional) If your device has a separate vbmeta partition, you can patch the vbmeta partition with command:
    fastboot flash vbmeta --disable-verity --disable-verification vbmeta.img
I don't know from where I was supposed to get vbmeta.img. The instructions never mentioned getting vbmeta.img. Maybe it doesn't matter because the step is optional, and it says "you can patch the vbmeta partition", not "you should" or "you must".

When extracting boot.img from my phone's firmware I also got vbmeta.img, but I don't know if I should flash it as it is, or if I should have Magisk patch it first. Anyway I skipped that optional step and Magisk works, but it would be nice if the instructions were more clear.

I also don't know if the fact that Magisk works despite me skipping that step has anything to do with the fact that before installing Magisk I had dirty flashed LineageOS 19 over LineageOS 18.1, where I had already installed Magisk some months ago by flashing the apk from recovery. The reason I had to reinstall Magisk is that after the upgrade to LOS 19 apps with root permissions would complain about not having root permissions, and the Magisk app would say Magisk was not installed.
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