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Seems like we are out of luck.
Downgraded to the firmware 3.10 for the 396 and applied the SD card patch.
Doesn't work.

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Thank you for your help

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first rename it as its original and just replace this .gcd file ... as described in Post # 105, Methode 2 (with USB connected device) ...I think it would help ... work on your own responsibility...

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With the phrase "Whould you try with a previous release of firmware?" I meant trying a Custom SD Package with older version of Firmware.
If you downgrade with Original Firmware and then reapply the same Patch, you get the same Firmware release
Moreover, Zumo 396 start with Firmware release 3.40, where do you find v 3.10?

This is a custom SD flash kit only for HWID 3033 devices (Zumo 346-396), firmware version 3.40

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Zumo 346-396 (3033) fw3.40.rar

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Instructions: see

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I have archived all the firmware upgrades starting from v3.10 off the original device.

I have applied the sd patch to v3.10 too.

Will try the 3.40 version in a bit.


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Tried the 3.4 and 1.gcd file.
Doesn’t work.
Map is displaying okay but Routing is abnormal.






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It is very strange. I experienced Patch v 3.50 on a Zumo 346 and European Map work like a charm.
Maybe the Patcher doesn't work on Asian Maps

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Perhaps. I shall try an European map to confirm this.
This is interesting news.


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Yeap. Sadly 2018.20 Europe NT works.


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try this .gcd .... it is for the sw340 ... the one before it was for the sw350

I also have issue with GPS restarting while connected to traffic cord. Is there a known software version that used to work properly while patched with this unit? Under 4.50 it recognizes the maps (European) and works properly while on battery, but when connected to the traffic cord it restarts randomly.

Drivesmart 61; HWID 2588; Firmware patched 4.50 (4.51)