Place the bootloader on a USB the map looks like
ET9000 model /et9000/cfe.bin
ET5000 model /et5000/cfe.bin
(The ET6000 and ET9200 have at the moment allready fom factory the latest bootloader)
Place the USB-stick into the receiver and reboot the box by the powerswitch on the backpanel.
To activate bootloader uploading you must press on the frontpanel of the ET9000 the OK button and on the ET5000 the arrowup button. Just wait till the box has loaded the bootloader and is restart.
After it you can load the image for the ET9000 models with directory /et9x00/ and et5000 models with /et5x00/