I have tried to reset the 7911 and 7970 phones by pressing and holdoing down the # key after I have powered it on but the LCD becomes blank, it doesn't show the message to press the 123456789*0# to reset. when it comes up too, it will only be showing the home page without responding to any key not even the menu key.
I normally hold down the # key as it powers up and keep holding it until all the lights flash. I find once I release the # the line keys lights will cycle through one at a time then I perform the keypad sequence to factory reset.
Also make sure that you do the reset on a network that has DHCP and the TFTP option set.
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