I don’t have any particular insight here, but I do have an On that’s conveniently already in pieces because I’ve been messing around trying to 3d-print a replacement switch. (Lots of trial and error there…) I looked at it to see where the license transfer hole is, and took some pictures.
Here are the two pieces pulled apart. The black piece on the right is the bottom panel, which is just a piece of plastic. The green one with the circuitry is the top panel. The screen is face-down on the table, at the top of the image where there’s an upside-down 13. I assume that’s a factory marking. (Interestingly, the one I took apart in the other thread has a 12 in the same spot.)
The parts within the blue circles are the interior of the poke-hole on the bottom panel, and the part being poked. The poke-hole lines up just about perfectly with the center of the big button, which is face-down on the table. Here are some better pictures:
If you take it apart, you can look at that spot to see if it’s physically damaged. I’m not sure what you could do about it if it were, but at least you’ll know.
As others have suggested, connecting it to the Roger Upgrader is worth a try to see if it’s truly dead. I tried that when I was trying to figure out the switch problem, hopeful that it might be a software issue that could be resolved by upgrading/reinstalling the firmware. It’s worth a shot.
Also as others have said, I don’t think you can transfer licenses to a non-iN version of the On or anything else. I think you can use a Roger Installer for that, and there are some being sold cheaply “for parts” right now, but I’d be very hesitant to buy one. With the On and Select, the seller can verify that it powers on without having or knowing anything about hearing aids. And so long as it powers on, it’s probably fine, and any problems are likely to be a relatively easy fix. But the cheap Installer listings don’t say anything about it powering on, so who knows? The cheap On v1s (that might have a faulty switch) aren’t that much more, probably come with licenses, and can be used to transfer them. I’d just get one of those if I were you.