Quote Originally Posted by johnfpc View Post
Hi, I just checked the 'GarminDevice.xml' on my zumo 590 software version 3.20 and the HWID seems to be 1796. I couldn't find any firmware for that code.
Right here: [Only registered and activated users can see links. ]

I couldn't perform the second method as ater pressing the "next" button twice, the screen shows only colors, no text or buttons.
Just keep pressing the lower LH corner, even if 'Next' button is absent pressing the corner will advance to the next page:
Quote Originally Posted by Neil View Post
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When the 'SW Ver' page shows, press 'Next'/lower RH corner until you reach a page headed 'Version Information' [some units need only one press, newer units need many presses to get there]. When on 'Version Information' page, press 'Start Test' > 'More'. That will reach the 'Inventory' page and its top 3 lines will show the second entry as 'Bxxx-00' where 'xxxx' is the HWID. [BTW, the third entry again displays the currently loaded firmware version]................