I just updated my Nuvi 660 from v.3.5 to v3.6 software and got the error message. Your procedure worked great,had the "System software missing" after a Webupdate_241.

garmin updating bluetooth firmware garmin nuvi-9

When the unit came back up again the following error came up on the screen: "system software missing" The Nuvi would not boot! HOLD down the power button and you will see "Pre Boot Mode" appear on the lower part of the display.

I contacted the local Garmin support rep and I was given the following sequence to recover from this condition: 1. KEEP HOLDING the power button down and the display will flicker, do this until the pre boot mode message disappears.

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For USB memory-1: File "DAB_V121.zip" download (62.4 KB) For USB memory-2: File "DAB_C11.0.2.zip" download (689 KB) IMPORTANT INFORMATION Prepare two USB memories.

When I tried to do it again, I got the message that the 670 was already updated,tried to update again,got the message"The update file is corrupted".

But your procedure worked,took a good minute for the flicker and then the Pre-Boot message to disappear,then it started loading some Bluetooth update and then came back to the normal screen.

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If you can prepare only one USB memory, copy the 1st file and update firmware. If you copy 2 files in one USB memory, it may cause error and fail in update.

If the error message appears, delete "13_dab_cayman1_16.bin" and "13_dab_cayman2_11_0_2.bin" file from the USB memory-1 and then update the firmware.

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