Amigo's quality:
[...]
It still amazes me how they can sell a so powerful and featured device so cheap.
The cool thing about repurposing these types of devices is that the hardware is often subsidized through the software. I.e. users 'pay off' the hardware through their software-/in-app/similar purchases. So if you can re-flash them with something custom, you sometimes get hardware at an incredible value.
Some components, like the power manager IC, don't have a English datasheet, so it makes it harder to develop proper firmware.
Feel free to send them (part numbers and / or datasheets) to me in direct messages; I might be able to work something out on that front.