you will need to try reflashing another image to the box. If your box is a clone it may have been killed by the Gemini timebomb, thats if they are still putting it in the 500 images. They hit thousands of boxes with the release of 4.31
If thats the case the only way back is by jtagging it as the bootloader would have been deleted by the timebomb.
You can try reflashing it with the rs232 connection using a null modem cable, not a serial lead.
I'm Going off my memory for the next bit as i haven't had to use dreamup for a while.
Switch receiver off. Connect your computer and receiver up to the null modem cable. You don't need the network cable connected.
You will then need to start Dreamup, click on flash image and it should then ask you to switch the receiver on.
If the bootloader is still there Dreamup should then confirm the receiver is alive and connected.
Select the image (Not Gemini, try S.I.F, Nabilosat, Pli or Powerboard Enigma)
Click on flash and it should resnd the image to the box. It will take over 10 mins to send the image over as the RS232 connection is really slow.
When its finished hopefully it should work.
If your box doesn't connect when you switch the receiver on when prompted by Dreamup you will have to jtag it to bring it back to life.
:-beer
Nano