You must put on a new bootloader and then put a new image(open pli et 5x00) in the et 5000, you must use an usb stick.
You must switch off the receiver, the usb stick with the new bootloader at the front side the receiver turn on and the bootloader is in the box, then switch the box off, the new image(et5x00) on the usb stick, the stick at the frontside of the box, then switch the box on and hold a few seconds the button above the ok button and then the image are loading into the box.
When you are ready the image are starting and you can install.the image.
Succes!!!!
Altobelli