You'll have to rename noforce.update to force.update otherwise it won't flash. This is done because you could otherwise unintentionally flash your Zero if you reboot your receiver with the USB stick still attached.
What happens if you reboot with the USB stick inserted but with the file noforce.update? Does the powerlight blinks at reboot?
With the Solo2 you have to push the powerbutton when the image is found.
Could you try to reboot your receiver with the USB-stick attached and observe the powerlight?
Better would be making a log while rebooting with the stick attached, I'm wondering if the bootloader waits for a key press or not.
So to recapture: to be able to flash rename noforce.update to force.update
Or to be complete as stated in the message-file:
To restore the image:
First rename the file 'noforce.update' on your USB-stick into 'force.update'.
Place USB stick in the USB slot and switch the receiver off and on with the powerswitch.
Update is in progress when the white light becomes gradually bright and dark on the front panel.
Update is done when white light blinks on the front panel.
Edited by Pedro_Newbie, 25 December 2014 - 16:55.