LOading Pois in a 4210

Received a new Mastro 4210 from Magellan as a replacement to my Roadmate 8oo
that crapped out ( Display went ). I backed up the files on my computer and
I'm trying to add some custom Pois.

Used the Magellan Poi editor to convert the Red light file. Everything went
okay; however; when it came to saving; it didn't go to a default location. I
had to pick where I wanted to save the file. I saw that on the Magellan
there was directory named USR and within that; one named CPOI. I just
assumed that was where the Custom Pois should go. Need to know if this is
correct; because me thinks that they are not showing or working.

I have also tried loading the Pois onto the Sd card. When I go to activate
the Pois; it tells me that none are saved!

Obliviously doing something wrong. Need some advice.