DNX 7260BT no NAV, garmin module memory wiped, cannot access garmin module

**Neil** · 29th October 2024, 03:09 AM

You may need to bear with me as i attempt to assist you with this because i'm going to be "learning on the job" to some degree, being as I'm not particularly experienced with Kenwood units. Here's my understanding and assessment of your situation at present:

The 7260BT works other than the Garmin navi, which when selected shows only a black screen with no writing or symbols.
You in fact do have preboot mode available. That's evidenced by the fact of when its connected to your computer via a USB cable, "GARMIN Devices" appears in Device Manager (If you were to click on the GARMIN Devices entry to expand it, like "inne urzadzenia" [other devices] shows expanded below it, that will list the DNX) however in preboot it cannot be browsed normally in Windows File Explorer like if it was in Mass Storage Mode).
If it stays in preboot mode indefinitely as i suspect it does (i.e. It doesn't disappear from Device Manager spontaneously after a set period, usually that's from 10 to 60 seconds depending on device type for a healthy device which has been intentially and manually put into preboot) that strongly indicates the main system software is missing or incomplete in region 14 (hex 0x0E).

So if you don't have to manually enter preboot mode, i.e. it's constantly available and stays shown in Device Manager as mused above, then rather than the entire Kenwood device being "bricked" requiring a hardware intervention to facilitate a repair, only the Garmin software is malfunctioning and in all likelihood that's due to faulty/missing firmware. Therefore, if the above info is correct, it's likely only "soft-bricked" and the fix may be as easy as simply re-flashing the fw as an RGN file using Updater.exe. That should overwrite and/or rewrite any missing fw data to specific regions of the flash memory. That process includes replacing the file img_rsrc.gir which is required to display images - it's contained in the GCD or RGN fw file, in a compressed file named pk_file66.zip. That ZIP file's loaded to the device like other fw BIN files are loaded to regions, however in the case of that ZIP it's loaded to region 66 and then likely auto-extracted following a successful boot cycle to write img_rsrc.gir and a folder "Langs" (containing all required Language GLR files) to the device's Garmin folder. The GIR file contains 1,585 symbols/icons in PNG and BMP format required to properly display those on-screen as required during normal operation.

Keeping in mind that i cannot try out any procedure beforehand that any suggestions i make and any files i supply will be entirely at your risk if you make use of them. I have no reason to suspect that anything i do or recommend will make your device worse and will use caution as if the device was my own property. On that basis and agreeing this disclaimer also applies to any further posts of mine here, i've attached below a kit for you to flash the latest fw in preboot. Look behind the Spoiler:

Spoiler: Click

There may be no obvious change to the device's screen while the flash happens or even immediately after Updater (hopefully) reports a "success" message. If it does report success, leave the device connected. It should soon spontaneously start to boot and enter Mass Storage Mode, then its File System will be visible in File Explorer, and it'll appear under Disk Management in Windows.

If the flash fails, please take a screenshot of Updater's error message and post it. Don't worry if it does fail, we have more to try including flashing a modified Cure fw to re-enable MSM allowing removal of some likely-corrupt files. Further action will depend on what you report back should Updater fail.

**JacobsJ** · 29th October 2024, 10:27 AM

No problem mate , it's a new experience for me also.

Okay after trying yesterday and making the pre boot wired for it to be manually set into preboot nothing changed ,
What we know , I added the preboot wires and if I don't connect them then I cannot program the board using the update.exe
Also , I will be trying your kit when I get home , as I'm not in home as of writing this.

Also from my testing I can change the SW Ver in the test mode , nothing else changes , I followed ORAK's guide from multiple post stating that I need to make it into preboot then program it using rgn file and reset the unit using the small triangle after following it's still soft bricked the garmin module , no sign of letting me into MSM also tried cure to just get into MSM unconditionally and to remove the files and move working img_rsrc.gir into the memory to make it work but at this moment I'm stuck where the update says that it successfully programed , I reset it and remove preboot wire connection and I reset it again and it's still showing black screen in the nav app

It shows in the updater that the boards software is 4.00 while in the test mode it was 4.30 , after uploading the rgn it did change to 4.31

The image shows a black screen with a navbar at the lower part screen with my music , no reaction from nav, I'm adding this info if the image host deletes the image or link dies

PS. You are correct with your assessment beside the fact that the "garmin devices" shows nevertheless if the module is in preboot or not , it is showing always . But! If it's in preboot the updater can see it , and if it's not in preboot then it cannot see it

P.S 2 I will try to archive the files for anyone who comes across this problem again , also Dnx7260bt is the same as Dnx9260bt

Spoiler: image

Those are all the photos I took while doing the process

Spoiler: image