Great you had the MC fixed, I assume the bike runs. Regarding the charging needless to say it is a very bad idea to exceed th 4.2V on any Li-ion cell. If the BMS talks to the CAN bus properly the values of the highest and lowest cell voltages should be displayed on the bottom LCD on the center display. Something like "hi 410" then "Lo 408". Without these the charger have no clue of the cell voltages and goes into "blindfolded" charging mode with constant 6A (60 km/h on the main display) which could lead to cell overcharging with the actual risk of thermal runaway.

It is pretty hard to damage the MC, as long as it has 100+ volts on the HV input terminals and the ignition pins (4 and 12) on J22 are shorted there is a good chance it will give the 12V DC. Even if you find an MC on eBay they tend to be quite expensive in the range of 300-500 EURs. If it is really broken might be better to fix it.In this case the first step would be to remove it from the bike and test it on a bench with 120V DC.

That is definitely a problem, should be fixed as the first step because this means the MC only has a few volts (maybe 30V if I am not mistaken) as high voltage input. Also these old NiMH batteries won't take you far, I assumed you would use Li-ion ref. your picture two weeks ago.

Does the "ignition" floating voltage on pin 12 falls to 0 volts when the ignition is on or the charging is started ?

"yes I did they are all ok"...The voltages or the fuses ?

That is bad new since it must be 12V (output of the MC 150V/12V DC-DC converter).

Do you have about 6V on pin 12 when the bike is turned off ? That is the "ignition" floating voltage which should go to 0 volts when the ignition key is on or the charging has started. Also 12V should show up in this case on pins 3,6,7,9.

Check the battery voltage, should be at least 100-110 V.

The sequence does not really matter.

Absolutely, you should set it to 50 Ah in order to have the SOC and as a result the range estimation working correctly. Even so you may need to adjust the charge level reading regularly as it tends to shift by time. With the Fran BMS you should be good, check the Fran directory on the Google share by Sylvain. I would strongly recommend to disconnect the charger and the BMS ftom the CAN bus when you change the MC firmware.

For the charger you can use the "EVPS LiMn 36s-2.hex" (< 60 Ah) or the "evpsli02last.hex" (< 120 Ah). For the MC I use the matching "MCR2042-4.hex" but the "MC_FRA20B01.hex" should work as well. On the ICM the generic "DIY_1708.hex" should be fine. The BMS firmware will depend on the hardware you have.