The Next Thing Co GR8 is clearly not made by Broadcom. Look at the bottom of

> https://getchip.com/pages/chippro

who comes in question as manufacturer of the SoC (hint: Broadcom is not among them). Also according to

> https://github.com/NextThingCo/CHIP_Pro-Hardware/blob/master...

it uses a Mali400 GPU (not a VideoCore IV as the RPi).