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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 > Mhd flash problems!! Help



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      09-13-2015, 06:44 PM   #1
modern_citizen24
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Mhd flash problems!! Help

Car won't flash getting hw:ffffffff then when it does decide to start writing it fails at 8% and says can't write packet 516 and various other packets. Tried flashing back to start and can't, car won't start and lights are going haywire. Assistance needed!
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      09-14-2015, 12:42 AM   #2
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Did you follow the notes that make sure you have battery charger hooked up? Yourncar ran out of battery juice. If you have a car battery charger hook it up. If not use another car as if your jump starting it and let it hooked up until the flash is done. Dont freak out. Mhd flash is pretty safe.
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      09-14-2015, 07:34 AM   #3
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It won't even connect to the ecu anymore
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      09-14-2015, 07:41 AM   #4
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Have you messaged martial at MHD?
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      09-14-2015, 07:43 AM   #5
335socal
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Quote:
Originally Posted by modern_citizen24 View Post
It won't even connect to the ecu anymore
You car battery tethered when you try to reconnect your dme?
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      09-14-2015, 07:52 AM   #6
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It connected once then failed...and yes I've messaged him said it was the battery but I just tried with a full charge and nothing
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      09-14-2015, 07:54 AM   #7
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Which cable do you have?
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      09-14-2015, 07:57 AM   #8
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Dcan cable from amazonhttps://www.amazon.com/gp/aw/d/B008MY1F8W/ref=oh_aui_i_d_rec_o0_img?ie=UTF8&psc=1
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      09-14-2015, 08:10 AM   #9
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Idk what else it could be
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      09-14-2015, 08:18 AM   #10
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From what I've read, the cables from Amazon are only hit or miss -- that is, they either connect and work, or they don't. I've not read of any that connect and then fail. Someone mentioned their OTG cable only had intermittent connections before they replaced it, though. If you want to make sure it's not the DCAN cable, the bimmer software . com cable is the cheapest one ($40) that is essentially guaranteed to work.
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      09-14-2015, 08:20 AM   #11
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The only time I got all Fs was when I didn't have a charger connected while flashing. Once I connected a charger and set it for 10 amps, I was able to flash to stock and then flash to a map. I wouldn't rely upon a battery with a full charge; I will only flash with a charger connected.
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      09-14-2015, 08:28 AM   #12
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Charger is on it and now it won't connect at all, I unplugged the battery in the back and will be trying again hopefully it resets? I don't have any other tune on my car and this is the first time I flashed anything. Help would be appreciated
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      09-14-2015, 08:53 AM   #13
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Anybody?
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      09-14-2015, 08:57 AM   #14
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My dcan cable came with a disk was that needed in any way?
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      09-14-2015, 09:40 AM   #15
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Disc not needed. Go into settings, apps and find MHD app. Force close, clear cache and data and try again. My cheap OTG connector is finicky so don't move it or the phone during the process in case it's like mine. If that doesn't work uninstall and reinstall the app and try again. Make sure the battery is charged and battery charger connected while u attempt. Your dme might have gone into recovery mod. With the BB flash you could force a write and bring it out. Not sure what to do when it happens with MHD.
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      09-14-2015, 10:23 AM   #16
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Quote:
Originally Posted by stanlalee View Post
Disc not needed. Go into settings, apps and find MHD app. Force close, clear cache and data and try again. My cheap OTG connector is finicky so don't move it or the phone during the process in case it's like mine. If that doesn't work uninstall and reinstall the app and try again. Make sure the battery is charged and battery charger connected while u attempt. Your dme might have gone into recovery mod. With the BB flash you could force a write and bring it out. Not sure what to do when it happens with MHD.
Ok thanks I will try that. I did try it on my Samsung tablet also this morning with a full charge and it did not work either
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      09-14-2015, 11:00 AM   #17
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Try boosting it with another vehicle. Your charger may not have enough juice.
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      09-14-2015, 11:14 AM   #18
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Quote:
Originally Posted by CanadianTSi View Post
Try boosting it with another vehicle. Your charger may not have enough juice.
The charger I have now is a 10 amp hooked up to the engine bay. Voltage at 12.6-12.9. Would I still need to hook it up to another vehicle?
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      09-14-2015, 12:16 PM   #19
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Quote:
Originally Posted by modern_citizen24 View Post
The charger I have now is a 10 amp hooked up to the engine bay. Voltage at 12.6-12.9. Would I still need to hook it up to another vehicle?
Just tether it to anothet car untill the flash is done.
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      09-14-2015, 12:46 PM   #20
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Also I'd like to mention when I had my s4 connected it would say high powered USB connected with a !. Any ideas?
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      09-14-2015, 12:58 PM   #21
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Quote:
Originally Posted by 335socal View Post
Just tether it to anothet car untill the flash is done.
Like I said it won't even connect lol
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      09-14-2015, 02:17 PM   #22
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Quote:
Originally Posted by modern_citizen24 View Post
Like I said it won't even connect lol
Your car even have juice now?
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