Where did you get GMAPPROM.IMG A12DE42E ???
I have search the web, got several different downloads & torrents including the version from this post 1.
My original locked file is the same as all others.
Maybe your CRC is for unlocked image ? Then this can not be checked, since unlocker generates new header for the file every time.
Problem still pending, unless a new map set is released any time soon and it will work fine.

So you can see, that most uploaders have the maps from same source :D.

This crc is from original map on my nuvi 2495LMT. The unlocked gmap-version from this map and a 2GB image I have posted in German Forum.

Did you try an unlocked image version or an self created image from gmap-version?

Problem found, solution not available ;-(
When you have ANY! version of CN Russia or other maps of that region activated
Europe zone has this zoom bug (I guess the CN RU map has a bad layer or something)
or it's a firmware bug. PS: Other regions are not effected (USA, Africa, Asia)