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Garmin DriveAssist 51 LMT-S Boot loop

Wed Jan 28, 2026 2:09 pm

Hi, I have this Garmin DriveAssist 51 LMT-S navigator, the model with the built-in rear camera. It basically stopped working out of the blue, or rather, when I try to start it, it displays the Garmin logo, then turns off and on again in an endless loop.

It seems to be slow;

CONNECTING TO THE PC WITH THE ORIGINAL CABLE IS NOT DETECTED.

I FOLLOWED A GUIDE ON THE INTERNET AND DISCONNECTED THE BATTERY, BUT NO ONE, THE SAME RESULT.

I NOTICED THAT THERE ARE 2 MICRO SD CARDS INSERTED, BUT EVEN REMOVING THEM DOESN'T MAKE ANY CHANGES.

Is it recoverable or should it be thrown away?

Re: Garmin DriveAssist 51 LMT-S Boot loop

Fri Jan 30, 2026 10:03 pm

Try this to get your PC to see the device.
GarminCure3
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Unbrick guide
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The two SD cards are for DashCam storage and additional map storage
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Re: Garmin DriveAssist 51 LMT-S Boot loop

Fri Jan 30, 2026 10:38 pm

..Thanks so much for the guide.
I wanted to know why when I try to boot it into PC mode or recovery before I can connect it to the PC, it gives me a white screen, then Garmin on a black screen, and it does this endlessly. Until the battery died because it wouldn't even shut down.

I hope it's a battery problem. And that it can be recovered.
If I can I will insert a video of the problem.

I solved the problem by opening updater.exe. I just have to manage to put the Garmin into recovery mode which keeps booting me up... black screen and fast white screen... I can't stop it... in the meantime I ordered a new battery for a possible replacement.
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