Just done mine. One important lesson learned. In the first instance I used a 128 GB ssd card ( formatted in NTFS) in a usb adaptor. After unzipping the file and inserting in the USB port in the car the update started. However when the progress reached 24% I received an error and a prompt on I-drive to change USB since current media is not supported. The navigation remained in "Loading " screen . No map visible. Then I reformatted in FAT 32 and tried again. Same result. As a last resort I changed tactic, bought a 32GB USB SanDisk 3.0 and installed again the map update on . This time all went seamless and the map is now update.
I guess the car recognised in the first instance that I don't have a pure USB inserted. Therefore, my advise is use a 32 GB USB as recommended to avoid any hassle .
I shared this just in case someone will face the same situation.
Wishing you success with update.
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