El error E80 se refiere a:
Wrong LDV version in NAND Flash. This is in new dashboard. You have the update but haven’t R3T6 resistor. You can:
-Downgrade to old dashboard, solder back the resistor and then update your xbox 360
-If you have CPU Key, get current NAND Flash image and fix LDV (just add 1 up to latest kernel)
Solamente has cambiado el lector o tienes algun tipo de jtag o similares ?