It is possible that something in the 800x480 resolution configuration is incomplete compared to the 480x272.
For example, if you are enabling a skin, or have a customized ui_igo9 folder, try deleting these from the SD Card you are using, delete any Save folder also, and try again. Any other (possibly customized) folders such as described here in the "Instructions" section may also need to be deleted:
Primo2-Repair-KitThe only exact reference I could find to
AZS_BR_NEZAR-1.spr was on a Russian site discussing a skin.
PS...an SPR file is basically a set of instructions to determine how a graphic (usually *.bmp) is displayed. They are typically paired by name such as fastfood.bmp
and fastfood.spr and may be an icon or POI set to display on the map screen.