You shouldn't flash TWRP image at all. The rooting procedure is the same for most Onyx devices, TWRP builds are different across them and as far as I know, only Max 3 has them. `fastboot boot magisk_patched.img` gives you root access until next reboot. I would suggest to do this first, since if something goes wrong, the device won't be bricked permanently, and a simple reboot will fix any problems that arise. If you're certain the patched boot image works as it's supposed to, only then do the "permanent" flash.
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