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device: add xiaomi-begonia #171
This is the first Mediatek device for Mobile NixOS.
Its introduction may help other contributors with similar vintage Meditak devices. The only one I have in mind is the Cosmo communicator.
Quick review of the device
This is not a device you should consider acquiring with the intent of running anything else than the default operating system. It was graciously provided to the project by a friend of mine. The device is extremely fussy and will brick itself harshly with no good reason.
It seems that some validation code for something, maybe the anti-rollback for MIUI, triggers if you look at the device wrongly.
If it weren't for a leaked engineering ROM, this device would be a good e-waste material, and nothing more. Even with the engineering firmware, it is still trivial to brick, the only thing it gives us is a way to unbrick.
Bricks are real enough bricks. Without the engineering firmware, the bricks require an authorized Mi account to fix, which you are unlikely to have (statistically speaking). It's not something trivial like a bootloop where you could go to fastboot to fix. They are real bricks.
I rate this device -1/10, do not buy.
Other things of note
Hmm, I want to check this out better, but it looks like shutdown is broken. It will boot back up.
It works fine with CFW TWRP, and the non-CFW engineering ROM, even with the CFW installed.
There is also an issue with the battery reporting -1%, but I figure it's "a" battery reporting -1% and other batteries are not, since CFW TWRP reports an appropriate percent.
If #174 had a solution, it would have these caveats listed: