GeeeTECH M201 - Bad quality 3D Printer 2-in-1 review

Geeetech M201, the printer is new and has all these defects.
It's not my first printer.

-Loss step (You can see the defect in the video, despite attempts to change the vref the problem remains)
-The structure is not straight, the front frame is not aligned to the XY plane.
- The threaded rods of the Z and Y axes is not linear.
- Smooth rods is not linear, tests on a marble floor and saw that it is very curve (probably the cause of the loss of steps)
- The motherboard is not working USB port, along with the head Geeetech technical, it does not allow even the firmware upgrade
-The damaged elastic coupling (I just paied 10 € to change it, but I have not solved the problem)
- The hotend have problems, side leakage of the PLA and the system is not working Bowden, extruder has two input for the filament and the entrance on the left does not work, maybe it's not free and something stops him.
-Underextrusion during filling (print good infill only 20mms a truly ridiculous speed)
-Firmware closed
-Motherboard may not update it you can install a new open source firmware
- Geeetech violated the open GPL Kindra Marlin, Marlin is open source and if you use it you have to release the source code, but Geeetech don't do that

[christophegiberne]

I'm starting the assembly again with a little more experience, I had abandoned it.
Has anyone been able to get it to work?