Can you link to any make/models currently available that work with this firmware?

[varung]

Variant

None

Control type

None

Control mode

None

What can we do to make the firmware better?

no

Describe suggestions or alternatives you have considered

Looking on amazon

[JacobWasTaken]

Firmware Compatibility
I'd assume most non-dirt-cheap hoverboard will work, and honestly there are too many brands to create a list.
I would look on Facebook Marketplace for cheap hoverboards, they're usually cheaper if the person lost the charger. You can find a lot ~$25, I've seen a listing for two for $20.