Installing Zyxel Armor Z2 (NBG-6817) from Stock-FW

ZyXEL NBG6817 (Armor Z2)

In the next days I will get a ZyXEL NBG6817 (Armor Z2). says:

Installation method(s):
see forum, see git-commit

If I click on forum, I get a lot of old links, one is [Solved] Zyxel NBG6817 flashing from OEM - #61 by tomasi

Can it be flashed in the meantime directly from OEM? Thought, that I read this, but I don't find it anymore.

Do I have to do OEM updates or whatever with a brandnew device before flashing openwrt?

Should I flash version 19 first, before trying rc?

The OpenWrt factory image can be flashed directly from the OEM firmware (for 19.07.x upwards).

21.02.0-rc1 (or newer) will be fine.

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