abderrahman5555,
The bad news is your chip is a Hynix HY27UFO81G2M which is not 2 GigaByte (2048MB) but 1 GigaBit (128MB). You will find the Hynix specification sheet for your chip
HERE.
Sadly your players chip has been hacked so that it reads as a 2GB chip. You possibly formatted it in the first place because you were having problems with player restarts, corrupt files, or files that would not play. These are the standard symptoms of a hacked player.
When you formatted the player you removed the software hack and and the true size of your chip was revealed. There is nothing you can do to fix this as your player never had 2GB capacity. You should contact your seller and ask him how a 2GB player only has a 128MB chip and demand a full refund.