Actually, in fact nuvi 68 HWID 2088 has 'strong' MSV in latest fw versions which almost certainly is your problem. Only early fw versions had 'weak' MSV. Unicode maps with changed code page and unlocked with gimunlock V0.04 will work when MSV is 'weak' as in your nuvi 55. To use either NT or NTU in your neighbor's nuvi 68 you'll need to patch the firmware, there's then no need to change CP. Similarly with the 55, you can patch it's fw too and then leave CP unchanged as 65001 in an unlocked map to get all unicode functions. When you know the map's been properly unlocked, the message "Maps are corrupt and cannot be used" is clear indication that the fw must also be patched.
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