Bafang M820 Firmware thread

[Joshack92]

Which is the best firmware for emtb on 48v battery?

 

[patdam]

Which is the best firmware for emtb on 48v battery?

Personally i'm use this 4812.

But it seem i'm "particular" user (1.93, 100Kg, high mountain use).
i have power cuts if i use 100% power in hard uphill (normal following bafang return) and occur with all software tested. i have setted S+ at 90% and i never use BOOST (setted at 100%)
I consume +- 1/2 less than M510, currently now with 9.6Ah battery, i never consume more than 60% (1600 D+ at max)

 

[like-bike]

Hi everyone, I have a problem with the firmware of my m820 48v. I should have the 25 km/h limit by law. I sent an email to Bafang but after a few emails nothing, he told me that it can be done with the phone via bluetooth.

 

[Freda]

Hi everyone, I have a problem with the firmware of my m820 48v. I should have the 25 km/h limit by law. I sent an email to Bafang but after a few emails nothing, he told me that it can be done with the phone via bluetooth.

So if I understand correctly your limit is too high. You can only limit the assist speed by a percentage from max with GO+ app. After you need to test where it actually stops assisting and adjust if necessary.
Only with BESST tool can you set an exact speed limit.

 

[like-bike]

So if I understand correctly your limit is too high. You can only limit the assist speed by a percentage from max with GO+ app. After you need to test where it actually stops assisting and adjust if necessary.
Only with BESST tool can you set an exact speed limit.

ok thanks a lot, bafang told me that via BT it was possible to update the firmware, made by them for me, to have the right limit. I don't know anything else. Too bad that from a smartphone it can't be done.

 

[Freda]

ok thanks a lot, bafang told me that via BT it was possible to update the firmware, made by them for me, to have the right limit. I don't know anything else. Too bad that from a smartphone it can't be done.

OK, now I understand. Yes you can update your firmware with the GO+ app. With the serial number from your motor it will automatically find update for you. You can not choose any other, only update or not update. That will probably solve your problem.

 

[like-bike]

OK, now I understand. Yes you can update your firmware with the GO+ app. With the serial number from your motor it will automatically find update for you. You can not choose any other, only update or not update. That will probably solve your problem.

well I don't know I tried from the app but I can't do anything. I think I'll buy the BESST, since Bafang doesn't answer me anymore

 

[like-bike]

hi, my engine does not communicate with my DIY battery and therefore my residual charge percentage is wrong. I don't know how to do it with the BEEST. does anyone know how to do it?

 

[ficorama]

hi, my engine does not communicate with my DIY battery and therefore my residual charge percentage is wrong. I don't know how to do it with the BEEST. does anyone know how to do it?

Greetings. Try another firmware. The same thing happened to me with one firmware. I don't know which one now, but I'll try to find it.

 

[like-bike]

Hi, I tried to update the firmware to the CRX30PC4812E102012.1. But nothing, I can't get the battery to be read.

 

[parnel bosch gen4]

Try 43v soft from post #4

 

[like-bike]

Try 43v soft from post #4

ok, but my bike is 48v. is it okay anyway?

 

[parnel bosch gen4]

Yes

 

[like-bike]

Yes

ok thanks done now i see the battery percentage. it is not exactly correct with the bms one, but it is better than before. regarding the firmware, how does it make the motor and battery behave?

 

[Coolspot]

Hi guys!
I just received my M820 to use on my LCE930 with Bafang 43V battery
Current firmware is CRX30PC4310E102001.6 (see attached picture)

Reading the 4 pages here it seams I have a 10A firmware for Road... Is it really the case?

Before updating to CRX30PC4313E102001 3_eMTB_230317 found on this thread, I want to know if the "2001.6" means it's a newer firmware than "2001.3".

Is there a way to backup my current firmware? I don't want to push an older version and not be able to put the one originally there.

Another question: when trying to cloud update with BESST Pro I get an error message saying my serial number should start with CR..

I do have a BESST Tool.

thanks!

 

[NWCO Emtb]

Hi guys!
I just received my M820 to use on my LCE930 with Bafang 43V battery
Current firmware is CRX30PC4310E102001.6 (see attached picture)

Reading the 4 pages here it seams I have a 10A firmware for Road... Is it really the case?

Before updating to CRX30PC4313E102001 3_eMTB_230317 found on this thread, I want to know if the "2001.6" means it's a newer firmware than "2001.3".

Is there a way to backup my current firmware? I don't want to push an older version and not be able to put the one originally there.

Another question: when trying to cloud update with BESST Pro I get an error message saying my serial number should start with CR..

I do have a BESST Tool.

thanks!

View attachment 151301

I'm in the same boat. Waiting on my my K1 flash to arrive. Then try and put put my less then qualified tech skills to work?

 

[like-bike]

hello everyone, i have a problem with the engine. after the first ride, i customized the engine a bit. but now it seems to me that it doesn't give me the power that it should give especially uphill. in the first ride on the display in boost it was indicated up to about 500/560 W. now it is 120/130 W. why? and still the battery percentage is not exactly right. thanks

 

[parnel bosch gen4]

Battery under 20 percent u have only 120w max in all modes

 

[like-bike]

Battery under 20 percent u have only 120w max in all modes

ok thank you very much... but from bms, it is more charged. can this limit be removed? also because it did it to me at 30 and more

 

[Freda]

As has been discussed here before, the percentage scale is wrong from bafang. 20 percent on display, is 50 percent on my bms. That is why it is even more enoying that battery saver starts already at 20 percent.

You can take out more of the battery by using 43V firmware with 48V battery or 36V firmware with 43V battery. It takes the battery down to 20 percent on bms when battery saver starts. This also gives you somewhat more power, but it makes the percentage scale even more messed up. It shows 100% until around 70 percent battery, then drops more quickly.

 

[like-bike]

As has been discussed here before, the percentage scale is wrong from bafang. 20 percent on display, is 50 percent on my bms. That is why it is even more enoying that battery saver starts already at 20 percent.

You can take out more of the battery by using 43V firmware with 48V battery or 36V firmware with 43V battery. It takes the battery down to 20 percent on bms when battery saver starts. This also gives you somewhat more power, but it makes the percentage scale even more messed up. It shows 100% until around 70 percent battery, then drops more quickly.

ok but sorry Bafang can't you fix this and/or give the possibility to remove it?

 

[parnel bosch gen4]

not possible tachnically i think 410wh battery 12s2p so only 2cells working together when you load 500w at only two dischcharged cells voltage drops dramaticly ,bms cut off voltage and ride finished

 

[Radolf]

Hi. Do you have any info whether Bafang has released any new software versions for the M820? I am particularly interested in the FW43V. Or is there any way to contact Bafang to fix the problem (in my opinion) of the motor working too long after pedaling?

 

[Waynemarlow]

of the motor working too long after pedaling?

Back peddling by even a few degrees will instantly kill all the power, easily learnt skill and it will allow all of us who enjoy the run on to continue to use that few milliseconds of run on to get us up difficult steps and through deep ruts without fully peddling.

 

[Radolf]

I'm not talking about ms but about 2 seconds or maybe even almost 3... Of course, a short stall can help on a technical climb, but sometimes there are situations in which too long a stall is dangerous - I know that it's not just my observation about too long a stall (which doesn't always happen).

 

[Waynemarlow]

I'm not talking about ms but about 2 seconds or maybe even almost 3... Of course, a short stall can help on a technical climb, but sometimes there are situations in which too long a stall is dangerous - I know that it's not just my observation about too long a stall (which doesn't always happen).

So just back peddle ever so slightly and you won't have the problem. Mine is the 48V version and it has supposidly the longest run on, but its no where 1 second let alone 2 seconds.

 

[Radolf]

I've ridden many versions of FW for 36, 43 and 48V batteries (of course, I'm still talking about the M820 engine) and I know the engine's behavior depending on the FW version... I agree with you, for FW48V the engine stall is OK but as I've already pointed out for FW43V it sucks! It's best on FV36V. I've already written about my observations regarding work on individual FW versions.
But back to the point, anyone know who needs to be slept with to get the information about this problem with FW43V to Bafang?

 

[Ger@anio63]

 

[Ger@anio63]

Hi I have a Cef-50
arrived in mid-December with the engine with the characteristics you see in the photo. In the engine you can only find the sticker you can see, no stamped number as in the previous engines. Someone recently received an engine with the same characteristics
I contacted Jean from SZZT to get some information on the speed and firmware since it's an e-road. She tells me that I can't change the firmware because my engine is a 48V and if I do it with Bafang Go+ it stops. I don't see any sticker or punch in the engine that says 48v, do you have any suggestions for me

 

[Radolf]

It can be assumed that if the manufacturer provides FW for 36V, 43V and 48V batteries and does not say that there are 3 versions of the engine, it means that every M820 will support the above software. Therefore, you must have BESST TOOL + FW that you want to upload and that's it (GO+ you will not change the engine FW).