Mi Robot Vacuum Mop 2 Pro+ (Problem+)

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Hello everyone.
I have recently bought this beast (the Chinese model is called Mijia 1T), but it turn out to be a nightmare.
I'm sure the device itself is great, but mine has a great flaw.
There's something wrong with the front sensors, the device circles blindly and cleans only a portion of the room (1-2 square meters max, the apartment is 65 square meters).
It should move in an S shape, but it just circles like a headless chicken, often going in reverse.
I presume the front sensor makes it "think" that there's an obstacle and it goes in the opposite direction.
The problem is it always goes in the opposite direction, not being able to clean the room. It never even found the door.

The map it creates is a mess, often the position is wrong (if it goes twice to the same spot, the map could show two complete different positions).

I have basically no warranty, the seller asks to send it to China, to an inexistent address. Xiaomi Europe takes no responsibility and they told me that none of their service centers will repair it, even by paying them and that the seller should do it. No I'm left with a useless device and don't know what to do.

The only option now is to try to troubleshoot it, hoping in some good samaritan that has some experience with robots and is willing to give some advice.

Tried to reset the map, reset the wifi connection, factory reset the device, updating the firmware. All the sensors are perfectly clean, checked the cliff sensors, the front ones, the wheels are not blocked, the front bumper has no debris obstructing it.

Update: I think it's the cliff sensors!!! While I was writing this message it struck me and I tried it on a fabric surface and it seem to go smoothly! My floor is a laminate one (wood pattern), I dont think it should trigger the cliff sensors. It's pretty light color, not very dark.

Is there a way to disable the sensors on this model?

Please advice.
Best regards,
Alex.

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Update #2: I have opened the vacuum and tied together the white and the black leds. Now the situation worsened. It doesn't move anymore. It moves, but one centimeter at a time and often it tells that there's a strong magnetic field.
The map is a mess, it shows a fortress of virtual walls.
There probably is a magnetic field, but it comes from inside the vacuum itself...
Does someone know where the magnetic sensor is in this model? How can I trick it to return to normal or to ignore magnetic fields? I restored the cliff sensors as they were initially, but nothing changed
From bad to worse.