Hey Buddy GREAT NEWS !! I found this page on the internet, & here is the link below at the bottom, below some of the text from the page that I also copied and pasted for you:
Get GPX DVD remote codes!
If you have a GPX DVD player and want to control it with a universal remote control, we have the codes needed. A GPX DVD player can be controlled with any universal remote if you have the correct programming guide and the correct remote codes. If the codes below do not work with your GPX DVD player, please leave a comment below with the model number of your remote control and DVD player and we will find you the correct remote code.
AND AS A SPECIAL BONUS JUST FOR YOU !!! YES !! All the remote codes you are likely to need. These guys will even help you out if you still nee help
Program your universal remote control to a GPX DVD player. Use the following remote codes.
GPX DVD Player 4 Digit Remote Control Codes:
And if by chance this info just doesn't work, please just go to the " CODES FOR UNIVERSAL REMOTES " WEBSITE, as these guys seem to be real " FIRETRUCKIN' GOOD !! "
GOOD LUCK TO YOU !!