When I use a combination of buttons (the only one that seems to work is power and volume+) to access recovery mode, I don't see the expected android on its back with exclamation mark.

Instead, the android stands up (with a spinning logo at the front) and although it says the tablet has entered recovery mode, it proceeds to a normal boot.

This then leads back to my original problem: all functions useless due to "system uids inconsistent".
Can anyone please help?

Can you post some screenshots? If the recovery doens't started up, it's probably bugged/ or something happened. Try to reflash the firmware

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