You_Know , also you should make a backup of your firmware dump just in case anything happens in future and upload to the forum if possible so that others are able to use your backup for recovery.
Also, it is adviseable to format your player, 4Gb is likely a hacked memory and would only cause you alot of problems in the near future.
There are a few thread on earphone attachments and earphones for better sound quality. One by tadad1
Here and me
Here.