BenCatalan
Member
Creo que no hay un mejor que el otro, puede ser uno más adecuado a tu uso, cada uno tiene un entorno y historia diferentes.
Bafang M820 Firmware thread
- Thread starter Zimmerframe
- Start date
Hi!
When I flash this, I got CRX30PC4812 (not 13) - is it okay? And speed limit goes to 45 kph like in road
I tried FW43V with 48V battery - it feels more powerful on climbs, but great minus - You don't get battarey indication correctlyIn my opinion for MTB (mountain climbing):
- FW48V - the weakest, gives as much as you put in, such wavelike power delivery.
- FW43V - definitely better than 48V, there are many versions and the extreme versions differ greatly from each other.
- FW36V - the best for me, most resemble the support of the main players on the market, although they are far from them
Will try different 48V FW, not 43V
Yes, it does not display the battery charge correctly - but at least you can drive more on this software (it uses the battery more).
Dado, can you share these two FW36V?
BenCatalan
Member
Hi @radolt : are you using those 36v with a 48V motor too?In my opinion for MTB (mountain climbing):
- FW48V - the weakest, gives as much as you put in, such wavelike power delivery.
- FW43V - definitely better than 48V, there are many versions and the extreme versions differ greatly from each other.
- FW36V - the best for me, most resemble the support of the main players on the market, although they are far from them
So they went from 12A to 9A and now only 6A for 48V? That sounds like no fun..
BenCatalan
Member
May I have your help please on diagnosing this issue: then engine won’t just start!
I’ve been trying a 43v software which didn’t show battery life so did I try to go back to a 48v version but since then the display won’t turn on, so engine neither.
Battery is charged so can’t be this way to find a solution.
Any tips on how to get it back? Cheers
I’ve been trying a 43v software which didn’t show battery life so did I try to go back to a 48v version but since then the display won’t turn on, so engine neither.
Battery is charged so can’t be this way to find a solution.
Any tips on how to get it back? Cheers
Disconnect the power from the motor, reconnect it and try to turn it on.
BenCatalan
Member
thanks for this, that's what I di when I jumped out of bed: it now shows an error code 07, over power voltage. So ... did I use the Besst tool in conjunction of the K1Flash and went back to a regular 48V version, all is good and back in shape. Gottago to work now!
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Dado
E*POWAH Master
- Jun 28, 2022
- 1,031
- 657
This is not a M820 firmware.
CRX30PC is M820
BenCatalan
Member
You know what @Dado , this is the one I’ve tried to hook onto and that might have messed up my engine. I don’t know if my judgment is accurate, but there is a coordination of sequences that make me think like this!
Yes, for this naming is different, but I guess it can't be 6A - only 288 watt is too low
Hmm, I think You are right - after trying to install I got 30 Error code
Will try to disconnect battarey
parnel bosch gen4
Member
Are You able to do your own firmware with your knowlage?
Thanks a lot! I wrote Jean from Shenzhen Zhaosheng Carbon that it is wrong firmware
Hope after the battery disconnection all will be okay and I will be able to install correct one
Dado
E*POWAH Master
- Jun 28, 2022
- 1,031
- 657
You should.
But somebody managed to do it with UART controller for Bafang HD.
Thats not easy to do whole control without having even scheme of controller or source code.
But somebody managed to do it with UART controller for Bafang HD.
BenCatalan
Member
Well, that’s ugly for sure! I’m convinced this version had my system down when I’ve uploaded it: glad I was tooled enough to cope with this, but I ain’t sure everyone is.
That was poisonous.
Yes. Thanks god, after I disconnected battery for ~10 min, all was okay
I installed this one - Bafang M820 Firmware thread
Looks like its e-road (45 kph limit)
Also, I've deleted my message with wrong firmware to avoid people install it
Waynemarlow
E*POWAH Elite
Patdam, I've downloaded and installed your version, I'm getting quite a " rough " and really not smooth power delivery in higher cadences and higher power levels, are you getting the same ?
Can anyone recommend a " smooth " power delivery version at these higher cadences ?
BenCatalan
Member
I’ll let you know the one I’m using which smoothie as and quite sober
I tested all versions of 36V firmware. With global acceleration set to 4.
And for me best version is 2.5 - more effort is required to get top power witch leeds to better battery efficency, also no overrun here. But it shloud support more on high cadence.
3.2 - torque sensor too sensitive, too long overrun
3.3 - torque sensitivity better then 3.2 but still too sensitive, too long overrun, even worse then 3.2
3.5 - lack of top peek power
And for me best version is 2.5 - more effort is required to get top power witch leeds to better battery efficency, also no overrun here. But it shloud support more on high cadence.
3.2 - torque sensor too sensitive, too long overrun
3.3 - torque sensitivity better then 3.2 but still too sensitive, too long overrun, even worse then 3.2
3.5 - lack of top peek power
berglex
New Member
Hi there. Did anybody work with the "Open Bafang Tool" together with the BESST adapter on the M820?
Waynemarlow
E*POWAH Elite
Doing so at the moment, PM me and I will add you to the EMail list of how to.
berglex
New Member
@Waynemarlow : Hi. I am just 2 posts away from beeing able to write PMs. But I will write you when I got the PM status 
berglex
New Member
@Waynemarlow : I have already connected my M820 to the Open Bafang tool. You can adjust a lot more there than with the normally usable BESST or BESST PRO, e.g. the maximum current. So you wouldn't need a special firmware version to adjust this value. Unfortunately, I am a beginner in this area and have not yet dared to make such adjustments. I am therefore always interested in your feedback.
Waynemarlow
E*POWAH Elite
Not so sure about the max current as I‘m lead to believe that it’s hard coded. I have changed mine here but I suspect that although it seems the current has changed, I think it maybe only altering the max torque look up table and giving only a momentary gain.
The good thing is the motor seems very tuneable, but only within some weird constraints that includes speed of all things. I already have mine tuned in Boost to an almost Bosch like feel, but those settings have repercussions elsewhere in the lower assist levels, working on it.
The good thing is the motor seems very tuneable, but only within some weird constraints that includes speed of all things. I already have mine tuned in Boost to an almost Bosch like feel, but those settings have repercussions elsewhere in the lower assist levels, working on it.
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Waynemarlow
E*POWAH Elite
Amps hard coded I'm afraid . 
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