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(boot X5 from USB= upgrade X5 by RS232 port )
If your receiver is dead or can not turn on ( have light on panel, but can not work), can have a try to boot X5 from USB:
Booting from USB-Drive
1.- Create “recovery” folder in USB drive
2.- Copy KD_P9000E_HD.bin file to the “recovery” folder of USB* drive.
3.- Attach the USB device to the STB via any available USB port.
4.- Turn power on while pressing OK key on front panel.
5.- Keep pressing OK key until showing “Lxxx” message on LED of front panel.
6.- Check TV...