Thread: Updating a 4 year old NUVI 255W ???

OK.
I had placed the new gmapprom.img file into the Garmin folder on the SD card, but had deleted the old gmapprom.img on the GPS.
The GPS said that there were no maps installed.
So, I put the old gmapprom.img back onto the GPS.
I told me that CNNAM 2010.10 was the issue installed.
I went looking and found that the new gmapprom.img had to be renamed to gmapsupp.img.
After doing so, the GPS said that CNNAM 2015.10 was the issue installed.
I just assumed the old gmapprom.img had to be installed also.

What you said makes sense.
So, I deleted the old gmapprom.img again.
The GPS still ID's the issue as CNNAM 2015.10.
I think she is up and running now.
And now, the lady in the GPS has up to date information to work with.

Thanks to all three of you for your help with getting this done.
M'Lady will be happy.
When she's happy my life is much easier.