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BMW 3-Series (E90 E92) Forum > E90 / E92 / E93 3-series Powertrain and Drivetrain Discussions > N54 Turbo Engine / Drivetrain / Exhaust Modifications - 335i > Battery shutting off while updating jb4



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      05-12-2018, 04:56 PM   #1
MSully96
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Battery shutting off while updating jb4

So I’m in a bit of a jam. I went out to update my jb4 firmware and while verifying the upload my battery charge low came on and turned the car off- thus not completing the update, and leaving my car undrivable since it doesn’t have current firmware. I went and bought a 15amp charger and will let the battery go to 100% charged and wait til the charger is just “maintaining” instead of “charging to try again. If that doesn’t work I don’t know what to do.
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      05-13-2018, 09:43 PM   #2
Mike@N54Tuning.com
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Once fixed just upload the firmware again.

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      05-13-2018, 10:32 PM   #3
EndOfAnEra
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Sounds like you need a new battery
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      05-15-2018, 02:34 PM   #4
MSully96
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All resolved.

Started pouring down rain while I was installing a new battery and of course I made the day worse by shutting the trunk with the battery disconnected. My buddy hooked up jumper cables so I could push the trunk release inside the car (Thankfully I left it unlocked) then I installed the battery, registered it, and the firmware updated just fine and the car is actually running pretty good compared to before the update. I also restored default JB4 settings to allow the car to re-adapt.
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