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BMW 3-Series (E90 E92) Forum
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MHD Tuning - Failed to Authenticate/Failed to Write DME
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10-05-2018, 03:49 PM | #2 |
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what version is your DME? does it need a benchflash?
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10-06-2018, 12:18 AM | #4 |
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Drives: 2020 M340i
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What version of the MHD app, and what device are you running it on? Are you able to use the MHD app to read codes?
Have you tried connecting to the DME using INPA or ISTA-D/Rheingold running on a laptop? Do you have a JB4 installed?
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10-06-2018, 12:19 AM | #5 |
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Drives: 2020 M340i
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Based on your post in the N55 mileage thread, you have a 2011 N55, which doesn't require a bench flash.
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2020 M340i | Mineral Grey Metallic | Premium | Exec | Adaptive M Suspension | Harmon/Kardon
Previous: 2011 E90 335i | Black Sapphire Metallic | 2007 E90 335i | Monaco Blue Metallic |
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10-06-2018, 03:57 PM | #6 | |
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Quote:
Last edited by FullAuto; 10-06-2018 at 03:58 PM.. Reason: r |
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10-06-2018, 04:06 PM | #7 |
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10-06-2018, 05:07 PM | #8 |
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Just to add a bit to that procedure you had listed there, you need to be sure the ignition is still ON when you're starting the flash.
1. Battery Charger 2. Doors closed, key in, ignition ON (cluster should show CEL to indicate ignition ON) 3. All draws OFF 4. Phone in airplane mode, make sure MHD isn't already open in recent apps. (The only time I ran into problems flashing was when the phone automatically opens MHD on top of one I already had open in the background, might have been coincidental.) 5. Connect to OBD, MHD opens. 6. DO NOT open any doors as it will turn ignition off. Verify CEL still on before starting flash. 7. Start flash and don't touch anything until it's complete. Have you been using the same OTG adapter between the two devices you tried? Maybe that has some sort of problem. |
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10-06-2018, 05:39 PM | #9 | |
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Quote:
I'm waiting additional feedback from MHD but it's not looking too good. I can read codes, erase them all thru the cables as well. I don't even get a percentage on the status of the flash. It'll just state connecting to the DME, couple chimes, couple lights come on, then failed to authenticate, failed to write the DME after 5 minutes. Car starts back up after about 15 minutes. |
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05-01-2019, 09:30 AM | #10 |
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I am experiencing the same issue. 2011 x5 n55 e70, I verified I also do not need the bench flash. I have contacted MHD last night with a lengthy email. Did you ever find a resolution to this?
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05-02-2019, 07:42 AM | #11 |
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First i've heard of not being able to flash on MHD, Its definitely between the software and DME. This last MHD update has been an adventure for most. I'll sub, i want to know the cause of this..
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