trouble putting legit map on SD card help please

[we are borg]

I have a 720 and have tried to download the official map upgrade 845.2645 and there is not enough room on the device so i have tried to get it on a Sd card.

I have backed up my device and then put a card in which should be recognised them restored to it and then tried update but with no luck.

any help appreciated.

we are borg

[Russell1]

I had a similar problem with my Go730, you should just be able to add the new map to the memory card, but remove the existing map from the unit.