trishle , you have killed your player by upgrading with an incompatible firmware. What you need to do now is perform the Dead Player Recovery found
Here.
Regarding the memory, it is a hacked chip. There are currently no 4GB players. These players can only support a maximum of only 2GB, and your player is likely a 1GB hacked to show 4GB.
i'll suggest you contact your seller for a refund.