GPSMAP 66 GPS Software 2.70

Discussion related to the Garmin GPSMAP 66s/st GPSr
g66
Posts: 135
Joined: Wed Jul 03, 2019 1:48 pm

Re: GPSMAP 66 GPS Software 2.70

Unread post by g66 »

Just got an info from garmin, that it is not possible to downgrade the GPS chipset-firmware

Sorry, i dońt know any solution.

But you could share the video on youtube, to get maybe better feedback about people having the same issue, and garmin to enforce a bugfix. 8-)


I will us it for hiking maybe in a week.
rogerm
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Joined: Sat Mar 09, 2019 3:19 pm

Re: GPSMAP 66 GPS Software 2.70

Unread post by rogerm »

On my last 66s that I recently RMAed I used to have satellites disappear when resuming from expedition mode. I found rather than rebooting, just going to the satellite page and selecting "Use with GPS off" and then turning back on was enough. I had it with GPS Software ver 2.5 though I think firmware version 3.0 made it much worse.

I don't know if I get it still, I've given up on expedition mode since I find it too buggy. I reported a problem on the forum earlier about the odometer jumping by thousands of kilometers which was the reason for the RMA. The new unit does the same. When at home going into and out of EM will often add 9824.6km. Distance is consistent between the two units (except one day when it was consistently 20km or so). At one location in Yellowstone, the distance was consistently 13301km. When I returned the unit the odometer was over 500000km and I managed to overflow the trip odometer (> 100000km) in one two hour walk. I'm still surprised nobody else has mentioned it.
Art
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Joined: Sat Nov 10, 2018 9:14 am

Re: GPSMAP 66 GPS Software 2.70

Unread post by Art »

Garmin should provide a rollback version if they supplied a dud.
It’s a MediaTek MT3333 GPS chipset by the way.
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GPSrChive
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Re: GPSMAP 66 GPS Software 2.70

Unread post by GPSrChive »

I suspect you will find that large distance that is added to your trip odometer is the distance from your actual position to 'null Island', just off the west coast of Africa...

Although I have experienced similar behavior under different circumstances, I also have reported this phenomenon to Garmin.
g66
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Re: GPSMAP 66 GPS Software 2.70

Unread post by g66 »

Art wrote: Thu Aug 29, 2019 1:06 pm Garmin should provide a rollback version if they supplied a dud.
It’s a MediaTek MT3333 GPS chipset by the way.
Why do they call it 3313 if it should be a 3333
https://www8.garmin.com/support/downloa ... p?id=14457
Art
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Re: GPSMAP 66 GPS Software 2.70

Unread post by Art »

They call it MT3333 in the GPS firmware version 2.60 and in 2.70.

Is there a way to upload a file here or something?

I’ve created a 2.60 GPS chipset file that identifies itself as version 2.71 inside the gcd file wrapper,
and recalculated the outside gcd checksum, then copied it to the device Garmin/RemoteSW/ folder.
This is enough to fool the GPS into accepting the update. It displays as 2.60 again in the About screen.

It will also keep updating so long as the file is present on the SD card.
You have a few seconds between each update to power the unit off,
and connect it to a PC again in USB mode to delete the update file manually.

The downside is that if the next legitimate version happens to be 2.71, the GPS won’t accept the update.
Art
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Joined: Sat Nov 10, 2018 9:14 am

Re: GPSMAP 66 GPS Software 2.70

Unread post by Art »

Use at your own risk, and don’t power the unit off while updating, but immediately after.
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g66
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Re: GPSMAP 66 GPS Software 2.70

Unread post by g66 »

Could you also call it 2.701 ?
Art
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Re: GPSMAP 66 GPS Software 2.70

Unread post by Art »

Nope. That’s actually a later version if it were possible (which it isn’t).

It’s 270, and 260. There is no decimal point.
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GPSrChive
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Re: GPSMAP 66 GPS Software 2.70

Unread post by GPSrChive »

Art wrote: Thu Aug 29, 2019 3:02 pm Use at your own risk, and don’t power the unit off while updating, but immediately after.
Which GPS Chipset Software version is this? And what have you done to modify it?
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