Netgear RBK750 Installation

Is it possible to install openWRT on this Netgear model now or should I wait until it appears on the supported devices table? It it can work now, which model image should I download? Thanks.

Depends on the hardware inside.

I've tried searching for hardware manufacturer details but have come up empty so far. Would you have any tips for how to search for them?

Check if there are photos of the internals of the device at https://fccid.io/search.php

If not, open it up, take some, post them here.
Might be needed anyway, since the ones att fcc can be blurry.

I found some photos on FCC
https://fccid.io/PY319400470/Internal-Photos/Internal-photos-4603355