Ericsson MP3 Player can't read MMC properly

I bought the mp3 player from ericsson to use on phones.
I can make it work with no problem.
bought a MMC 128MB to use with the mp3 cause it comes with Ionly 8MB built-in.
my problem is that it dont recognizes the MMC card as 128MB. It only shows 8MB.
My first tought was that it could read the MMC, but I connected the MMC to my computer using a MMC reader and it only shows 8MB. I can't change it's format using anyway I know of. And it can't be formated using the low format function on the mp3 player.
Please help me.