Calibration Process for SkyRC Imax B6 Mini Charger: ENTER + DEC Button Guide

Hello, I have an imax b6 mini charger and I would like to calibrate it, I found a guide on youtube on how to do it, hold the enter and Dec buttons while connecting to the power supply and such a menu should appear (the so-called service menu), but all I see is
"system update please wait" the display fills up with rectangles and this is how the charger still works after reconnecting it to the power supply. I want to calibrate because the charger is wrong about 9mV with lipo and lion packages. Can you enter this menu somehow?

As far as I know, this key combination was used to update older versions of IMAX, those without USB (large and ACv1). To mini and ACv2 you can upload soft, probably 1.14 and then calibrate from the menu of the charger. I will not cut myself for the correctness of this information, but I hope that at least to some extent I will lead to the right trail.

Here a colleague nicely describes:

https://www.elektroda.pl/rtvforum/topic3287318.html

However, as you can see, his software update was unsuccessful, so I don't take responsibility for any damage to the equipment caused by my hints. You do everything at your own risk.

For me the soft first sat down, I mean to set the voltage on the main pins, but it seems to me that the charger sees the 9mV difference because when discharging the cells it is like 3.10 but it still flies after checking the meter when the battery is these 3.10 it turns off the discharge. When I start controlling it from the computer, then the terminals have the correct voltage. Well, I see that I will have to recharge lipo'le by computer.