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You are correct, .4 is for the 860C display.

I just installed V20.1C.4 about a week ago with good results, from V20.1C.3. There are a lot of bug fixes that were found in versions .2 and .3 and with added assist modes and functions.

Update, I finally made time to replace the controller, add thermal pads to the motor, update OSF V20 to .4 and now everything is back to normal. The controller was the culprit, but I not sure if my shutting off the battery first caused the "Brake Error" failure or just a defective controller...

Thanks for your replies, I will give that a try.

Yes, I get the error even with both brake sensors unplugged.

I did try a replacement Display, with the correct firmware, and checked the cables for shorts/opens and I still get the brake error. Everything has been working flawlessly for the past year, until this problem.

TSDZ2, 860C, 52V, OSF V20.1.3.....Just got a brake error after one year of no problems. This started after a recharge to 58.6 volts and the error occurs with or without the brake cables connected. I can access the menu, and all looks good and normal accept I don't get a Voltage reading on the...

Early this year I purchased a Hub drive bike with a 750w/48v motor. I did not like the cadence sensor control because of it's quick pedal response and fast take-offs. I than converted my 20 year old Trek to a TSZD2 which was an improvement with the torque sensor but not great. I now have a 860C...

New to this forum. I have a 20 year old trek that has been converted to a TSDZ2, 750W,52V and a 860C display using OSF V20.1C3 . I find it a big improvement over the stock software especially on startups and climbing big hills. To date I have only put 30 miles on it in both road and off-road...