I have converted the Bird scooter successfully from the first attempt, which was about 7 hours of work for me.
I have watched the full conversation video of Samzone (thanks dude, you are gold) and after a lot of soldering i did it.
It goes well, about 32 km/h max on flat surface with one person and about 15 km/h with two persons(around 140 kg).
The battery seems to be great, because i rode about 20 km in cold weather and it dropped only one point out of 5. This should mean, that the battery will be good for around 50 km range, which is a lot.
it is a total pain to make the cable from the display go through the steering tube and at the moment the cable is taped on the outer side of it. Also the lights doesn't work, i have to solder the step down module and check why the rear stop light is not working. Btw i opened the controller box to add thermal paste, but surprisingly they had already put a lot of it.
Again, thank you Samzone, you did a great work converting and recording every step.