Have you done this
1. Unzip file 7.Mio C320 SD _ Primo.zip and copy the individual folders and files on empty SD card
2. Download and extract Primo
Place the loose files and folders in the Primo folder on the SD card
Question Overwrite files the answer is NO.
So the 320 is still original and the internal memory is not erased. Turn the 320 on and don,t touched the icons.
Put the prepared SD card in the 320 after a wile you should have a menu with the Primo icon.
You said the miomap icon doesn't work. What you mean exactly ?