Bafang M820 Firmware thread

[Freda]

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

My M820 motor was also bought as an 48V, it came as 36V, only the sticker said 48V.
In GO+ it was also 36V. Since I bought a light carbon frame, @JimLee-Lightcarbon sent my serial number to bafang. Now GO+ only checks for updates for 48V firmware. They must have some kind of register, what serial needs what kind of firmware.

My experience is 43V firmware available on this forum have looong overrun. 48V had much less, almost zero, feels more natural.
I have now gotten used to it, but would prefer less. I still use the 43V to get more out of the battery.

 

[Ger@nio63]

My M820 motor was also bought as an 48V, it came as 36V, only the sticker said 48V.
In GO+ it was also 36V. Since I bought a light carbon frame, @JimLee-Lightcarbon sent my serial number to bafang. Now GO+ only checks for updates for 48V firmware. They must have some kind of register, what serial needs what kind of firmware.

My experience is 43V firmware available on this forum have looong overrun. 48V had much less, almost zero, feels more natural.
I have now gotten used to it, but would prefer less. I still use the 43V to get more out of the battery.

Hi, so your engine also doesn't have numbers engraved on the engine body, just stickers like mine
I contacted Jean from SZST today, tomorrow he will contact someone at bafang to get the real characteristics of that motor let's hope it gets resolved in the meantime with this firmware I did 125 km with 1750 meters of altitude difference but I struggled I have no experience with e-bikes only with muscular feel free to advise me given your experience is similar to mine

 

[Ger@nio63]

con batteria da 720 Wh

 

[Ger@nio63]

con batteria da 720 Wh

with 720wh battery

 

[Freda]

Hi, so your engine also doesn't have numbers engraved on the engine body, just stickers like mine
I contacted Jean from SZST today, tomorrow he will contact someone at bafang to get the real characteristics of that motor let's hope it gets resolved in the meantime with this firmware I did 125 km with 1750 meters of altitude difference but I struggled I have no experience with e-bikes only with muscular feel free to advise me given your experience is similar to mine

No, my has engraved text. I bought it 1,5 years ago. About 3000 km used and running very smooth.

 

[Ger@nio63]

Hi guys
I ordered the beest tools does anyone have any firmware for the m820 36v motor
here I only found 1 of course I'm talking about E-mtb not Eroad which would be the one I have thanks

 

[Dado]

Hi guys
I ordered the beest tools does anyone have any firmware for the m820 36v motor
here I only found 1 of course I'm talking about E-mtb not Eroad which would be the one I have thanks

View attachment 153892

Not much firmwares out there. ;(

 

[aledavi]

hello

I am not an expert on these topics so I have some doubts.
I currently have this M820 motor with the 43V10A firmware.
If you would like to change this firmware to 13A.
I had a 410W bafang battery with 9.5 A, it could work, I would get that increase in watts in the motor with this battery.
Moreover where you can download the firmware of 43V 13A E-MTB.

greetings

 

[Freda]

hello

I am not an expert on these topics so I have some doubts.
I currently have this M820 motor with the 43V10A firmware.
If you would like to change this firmware to 13A.
I had a 410W bafang battery with 9.5 A, it could work, I would get that increase in watts in the motor with this battery.
Moreover where you can download the firmware of 43V 13A E-MTB.

greetings

There are three 43V firmwares in this thread. You can test them out to see which you like the most. You could also try 36V firmware, that would give you more power, let you take more out of the battery but the percentage on the display gets messed up. I don't know how it works when you have official battery with CAN though. I have only tried with DIY battery.

 

[aledavi]

There are three 43V firmwares in this thread. You can test them out to see which you like the most. You could also try 36V firmware, that would give you more power, let you take more out of the battery but the percentage on the display gets messed up. I don't know how it works when you have official battery with CAN though. I have only tried with DIY battery.

Hello.
Thanks for your reply.
But it does matter if the battery is 9.5A and the motor is 43V.
What I mean is, if I put a 13A fireware can it work with the 9.5A battery? Regards.

 

[Freda]

Hello.
Thanks for your reply.
But it does matter if the battery is 9.5A and the motor is 43V.
What I mean is, if I put a 13A fireware can it work with the 9.5A battery? Regards.

You are mixing pears and apples. Your motor is 43V, so is your battery. That is the Voltage the system is running. Controller of motor have a firmware using 43V so battery needs to be same. The 10A and 13A is maximum Ampere the motor can put out with that firmware.

Your battery is 9,5Ah or 9,5 Ampere hours. So it can theoretically provide 9.5 Ampere for 1 hour. This capacity of the battery. Often with ebikes displayed as Wh or Watt hours. In your case 9.5 Ah X 43V = 408.5 Wh. You can have any capacity battery, that only affects how long you can use it on one charge.

 

[aledavi]

Hello.
Thanks for the clarification.
Regards.

 

[BenCatalan]

I will receive the new M820 shortly but was curious of the K1 eBikes offer for this particular engine, their Flash system looks good to what I would like to solve, but if anyone could share his experience with them, I'll be happy to learn.
Basically, I want to get ride of the 20% limitation if it does apply and tune the power delivery to be more "natural" if possible. Cheers

 

[Charly]

Hello, I have been told that something new about the m820 is coming out in April. The mounts will be the same and there will be more power. Does anyone know anything else?

 

[BenCatalan]

Not much firmwares out there. ;(

View attachment 153922

Looking at what these offers, I might be a bit lost: look, I have an engine coming in a short while and I was considering to get the best of it. So an upgrade of software to get a more natural feeling, get ride of all limitations on battery shortage and increase a bit the top speed. What would you recommend?

 

[Charly]

Hi, can someone post a photo of the CEF50 charging port that shows up well? Thanks

 

[Ger@nio63]

Hi guys I installed a firmware but it gives me too much overrun could someone of you post this 36v firmware see attached photo

 

[Ger@nio63]

Hi guys I installed a firmware but it gives me too much overrun could someone of you post this 36v firmware see attached photo

 

[Ger@nio63]

I can't post the photo the firmware CRX30PC3615E102002.5. 230731 thanks

 

[Ger@nio63]

Ciao ragazzi ho installato un firmware ma mi dà troppo sovraccarico qualcuno di voi potrebbe postare questo firmware 36v vedi foto allegata

 

[clix]

@Dado

Can you please share following FW:

It looks to be the newest 43V 13A FW available.

I just recieved updated firmware from Chili, (attached) but it is 10A. I will try it out, just to see how noticable is 10A vs 13A

 

[parnel bosch gen4]

@Dado

Can you please share following FW:
View attachment 159288
It looks to be the newest 43V 13A FW available.

I just recieved updated firmware from Chili, (attached) but it is 10A. I will try it out, just to see how noticable is 10A vs 13A

Tested 10A software its a timewasting

 

[Dado]

Clix, it is noticable, believe me. Thats +130W.

Here is 13A.

 

[clix]

Thank you, Dado!

 

[parnel bosch gen4]

Clix, it is noticable, believe me. Thats +130W.

Here is 13A.

Is that newest?

 

[like-bike]

Clix, it is noticable, believe me. Thats +130W.

Here is 13A.

hi is there also a version for the more recent 48v?

 

[Dado]

Is that newest?

Rather old. Hard to get firmwares for M820, have not seen any for 43V in 2024.

 

[Freda]

Clix, it is noticable, believe me. Thats +130W.

Here is 13A.

So I tried this out. I am very pleased. Power output is smooth and only minimal overrun. Much more composed than the 2004.3 and 2001.3 I tried earlier. I was happy on the 48V firmware earlier, now I have the same feel, but with more power and longer range. I can recommend this!

 

[BenCatalan]

So I tried this out. I am very pleased. Power output is smooth and only minimal overrun. Much more composed than the 2004.3 and 2001.3 I tried earlier. I was happy on the 48V firmware earlier, now I have the same feel, but with more power and longer range. I can recommend this!

Thanks for the feedback, how is the power saving percentage?

 

[Radolf]

Hi,

I'm sharing a 43V firmware that I haven't seen here yet—maybe someone will find it useful...

I'll also add that I've tested probably all firmware versions for the M820 (36V, 43V, 48V), and in my humble opinion, the 36V versions give me the best riding experience. I use this bike only in the mountains, and for me, it works really well—I don't have to put in as much of my own effort, which is especially important to me during longer, exhausting rides when I'm already running out of energy

I ultimately went with an 11S3P battery built with LG M58T cells (660Wh), and recently I did 1440m of elevation gain (34km) using only the S mode on purpose (maximum power depending on battery voltage was between 320W and 270W), and I finished the ride with 37% battery remaining. For longer trips, I also built a bottle battery—11S1P (220Wh)—but I haven’t had the chance to test it yet. I estimate that this setup will easily handle 2000m of elevation gain.