I have the NAv pro and have updated successfully in the past.
Can I just check what the file structure looks like on the card after it has been extracted. My unit is not seeing the software - think this is the first release for MIB1 and MIB2. Do you just extract the version that suits your MIB version ?
on the root directory on the card I have
P134_N60S5MIBH3_EU_NT (1) - directory
WMPInfo.xml
The directory folder opens to
Mib1
Mib2
metainfo2.txt
P134_EU_Q1.15.md5
Can anyone confirm what theirs is please

Cheers