BAFANG M420 FIRMWARE UPDATE

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werewolf14

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Hi guys,

some time ago i've change cassette in one of my clients bikes, bike brand is MAXBIKE and it was originally on 9speed cassette and my client wanted 11s. After upgrading bike throws 21 error, but only when riding on two biggest crowns. After consulting manufactuer of the bike i have beed told that their firmware supports max 42t on rear cassette. I own a BESST Tool account and adapter, but where to find firmware to update the engine (M420), or is there a parameter to change in the program?
 
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Error 21 is speed sensor abnormality on the Bafang system. Out of curiosity, I've looked through the 3 firmware options which I'm aware of concerning the m420 and none of them suggests that they alter the behaviour whereby gearing would influence the speed sensor spoke magnet.
I appreciate that you've installed an 11 speed cassette but the big question is, 'does the derailleur allow for the higher gear ratio?'
Looking at the bike's specs, it comes with a S-Ride M400 derailleur (10/11spd) with a capacity of 42t. Whilst you can get 11/42t cassettes for 11spd, I presume your client/customer wanted an 11/46t, 11/50t or 11/52t 11spd cassette. Please clarify if you've swapped out the derailleur and shifter. A shimano m5100 derailleur and shifter would be sufficient up to 11/50t. Also, has the chain link count been factored in to encompass the new wide range cassette?

My best guess (if you've completely swapped the drivetrain), is that the rear wheel spoke magnet sensor is not positioned on a spoke which is farthest outboard depending on the spoke lacing pattern. Therefore, repositioning the spoke sensor to a different spoke (or using a spacer to bridge the gap of the speed sensor away from the none driveside chainstay), could eliminate the issue.

Failing all this, I'll have a word with one of my contacts who will be able to source you the different firmwares of the m420. I presume you have the besst tool and an account with Bafang?
 
Neeko DeVinchi said:
Error 21 is speed sensor abnormality on the Bafang system. Out of curiosity, I've looked through the 3 firmware options which I'm aware of concerning the m420 and none of them suggests that they alter the behaviour whereby gearing would influence the speed sensor spoke magnet.
I appreciate that you've installed an 11 speed cassette but the big question is, 'does the derailleur allow for the higher gear ratio?'
Looking at the bike's specs, it comes with a S-Ride M400 derailleur (10/11spd) with a capacity of 42t. Whilst you can get 11/42t cassettes for 11spd, I presume your client/customer wanted an 11/46t, 11/50t or 11/52t 11spd cassette. Please clarify if you've swapped out the derailleur and shifter. A shimano m5100 derailleur and shifter would be sufficient up to 11/50t. Also, has the chain link count been factored in to encompass the new wide range cassette?

My best guess (if you've completely swapped the drivetrain), is that the rear wheel spoke magnet sensor is not positioned on a spoke which is farthest outboard depending on the spoke lacing pattern. Therefore, repositioning the spoke sensor to a different spoke (or using a spacer to bridge the gap of the speed sensor away from the none driveside chainstay), could eliminate the issue.

Failing all this, I'll have a word with one of my contacts who will be able to source you the different firmwares of the m420. I presume you have the besst tool and an account with Bafang?
Click to expand...
Thank you very much for your reply. On my client bike there was 9s casette with 11-36t. I have changed it to 11-50t 11speed cassette. Speed senspor was my first thought, but it seems to be ok, especially that the bike works on crowns form 1-9 but speed sensor fault shows only on the two biggest crowns. Chain length schould be ok too.
Manufactuer of the bike tells me that their firmware works only up to 42t.

Yes, i have Besst Tool with working account.
 
In another forum, it was solved like this, but M400 ... It's actually solvable, with the older M400 up to 42T it works without any problems.... When you go to 46-50T, there is jerking in the engine and speed sensor error 21... The solution is 2 magnets, and changing to 2 sensors, you can do it at home as long as you have a round 5pin + usb uart connection. Bafang for the m400 and more tooth cartridge solved it with new software...just replace, upload new software. By the way, improve the purchased bike, by changing the cassette, improving... When they are not enough for you, e.g. Slx derailleur or you switch to higher brakes on XT or even xtr so it's perfectly fine.... The thinking is, if I have a bike for the price, and suddenly I found out that I need a better, new one... why just buy a new bike , when only the brakes are enough... And that's exactly with the cassette, engine... unlocking... Etc... 20.03.2021 - 19:29:31 00
 
Neeko DeVinchi said:
Error 21 is speed sensor abnormality on the Bafang system. Out of curiosity, I've looked through the 3 firmware options which I'm aware of concerning the m420 and none of them suggests that they alter the behaviour whereby gearing would influence the speed sensor spoke magnet.
I appreciate that you've installed an 11 speed cassette but the big question is, 'does the derailleur allow for the higher gear ratio?'
Looking at the bike's specs, it comes with a S-Ride M400 derailleur (10/11spd) with a capacity of 42t. Whilst you can get 11/42t cassettes for 11spd, I presume your client/customer wanted an 11/46t, 11/50t or 11/52t 11spd cassette. Please clarify if you've swapped out the derailleur and shifter. A shimano m5100 derailleur and shifter would be sufficient up to 11/50t. Also, has the chain link count been factored in to encompass the new wide range cassette?

My best guess (if you've completely swapped the drivetrain), is that the rear wheel spoke magnet sensor is not positioned on a spoke which is farthest outboard depending on the spoke lacing pattern. Therefore, repositioning the spoke sensor to a different spoke (or using a spacer to bridge the gap of the speed sensor away from the none driveside chainstay), could eliminate the issue.

Failing all this, I'll have a word with one of my contacts who will be able to source you the different firmwares of the m420. I presume you have the besst tool and an account with Bafang?
Click to expand...
HI, I've a M420 bafang motor, and I'm looking for firmware for Canbus M420 controler 43 volts . I have to replace controler but only 36Volts is selling . If I buy besst tool , I could update new 36V controler to 43V ?
Do you have this firmware ?
 
manuroup said:
HI, I've a M420 bafang motor, and I'm looking for firmware for Canbus M420 controler 43 volts . I have to replace controler but only 36Volts is selling . If I buy besst tool , I could update new 36V controler to 43V ?
Do you have this firmware ?
Click to expand...
Hi there,
Sincere apologies for the delay (work commitments).
Please bare with me. It would be easier for me to get my colleague to forward the 43v firmware to you or share it to this thread.

If I anticipate a delay in my colleague doing this, I'll step in and share it to this thread👍🏿
 
Hi ,
Yes exaclty, I would like to get this firmware, last one FC. 3.0 if possible for CRX10V.350 controller (or previous xxx. FC.2.0 / FC.1.0)
 
Neeko DeVinchi said:
Hi there,
Sincere apologies for the delay (work commitments).
Please bare with me. It would be easier for me to get my colleague to forward the 43v firmware to you or share it to this thread.

If I anticipate a delay in my colleague doing this, I'll step in and share it to this thread👍🏿
Click to expand...
Hello Neeko.

Dont u have some new M420 firmware to share?

I have only some very old one.

Thx.
 

Attachments

Sadly not @Dado.
I remember enquiring about this a while back and the general theme I got from multiple Bafang distributors was Bafang have stopped making newer firmware for the M420 as of from 2021.

Support still exists for servicing. But I suspect Bafang opted to concentrate their efforts on their other motor models.
 
Ah ok, thanks for answer. That is sad they stopped making new soft. :(
 
Firmware 36/43/48 volts for bafang m420 CAN.
 

Attachments

Dado said:
Привет, Нико.

Есть ли у вас какая-нибудь новая прошивка для M420, которой вы могли бы поделиться?

У меня есть только очень старый экземпляр.

Спасибо.
Click to expand...
Если это еще актуально, я прикрепил.
 
Deko said:
Firmware 36/43/48 volts pour bafang m420 CAN.
Click to expand...
Hi Deko , Do you know if there is a alternative way to flash firmware without besst tool bafang.?
Actually , I using innomaker soft and canbus interface to get some fonctionality , like wheel size, max speed, calibration etc. But I cant flash firmware

your CRX10VC4313h102075.2 2023-3-8 OTA.bin for 43V M420 is the last version at this moment ?
 
Last edited:
manuroup said:
Привет, Деко! Ты знаешь, есть ли альтернативный способ прошивки микропрограммы без использования Best Tool Bafang?
На самом деле, я использую программное обеспечение Innomaker и интерфейс CANbus для получения некоторых функций, таких как размер колес, максимальная скорость, калибровка и т. д. Но я не могу прошить микропрограмму.

Ваш файл CRX10VC4313h102075.2 2023-3-8 OTA.bin для 43V M420 является последней версией на данный момент?
Click to expand...
I couldn't flash the version you wrote either, apparently it's for a different version of the controller. I rode this one:https://www.emtbforums.com/attachments/crx10vc4313e102006-3-boot3-0-_201006-bin.165398/
 
Alternative software Bafang Canable pro master, I've been using it lately.
manuroup said:
Hi Deko , Do you know if there is a alternative way to flash firmware without besst tool bafang.?
Actually , I using innomaker soft and canbus interface to get some fonctionality , like wheel size, max speed, calibration etc. But I cant flash firmware

your CRX10VC4313h102075.2 2023-3-8 OTA.bin for 43V M420 is the last version at this moment ?
Click to expand...
 
manuroup said:
Большое спасибо. Вы не знаете, есть ли более дешевая альтернатива системе инструментов Besst Bafang для прошивки контроллера?
Click to expand...
Bafang Canable Pro Master
 
sponsje said:
@Deko Je possède le CRX10VC3615E102007.3-CR X10V.350.FC 2.2. Lorsque je modifie des paramètres comme la vitesse, après une mise hors tension/sous tension, la vitesse revient à 25 km/h. L'écran affiche la vitesse configurée (par exemple 45), mais la vitesse réelle reste à 25 km/h. Est-il possible de mettre à jour le firmware ou existe-t-il d'autres solutions pour que la configuration soit prise en compte en permanence ?
Click to expand...
Consultez le forum Endless Sphere, les messages de CiDi
there is a tip for permanent mod of speed limit. I done it , it s work full
 
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