If you use the name for a secondary supplemental map it should be "gmapsup2.img" (NOT 'gmapsupp2.img'). Most Garmin IMG-names use the old MS-DOS style with 8+3 limit. One exception is "gmapprom1.img".
Also check for latest firmware "KNA G520 software version 4.10" as of July 7, 2010. Maybe something is added to support 2010-2011 maps like the comment for Middle East and v4.00 or that you're using a SDHC card with a FW < v4.10?
One problem that may occur with a new firmware would be possible implementation of GMA digital certificates for MapIDs >= 2200. That should however not be a problem with a unlocked map.
Changes made from version 4.00 to 4.10:
* Added support for high-density SD cards to handle future map updates.
Changes made from version 3.90 to 4.00:
* Fixed compatibility issue with 2010 Middle Eastern map
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