So I believe I've followed all of the instructions.
I have a D7100, fully charged, on c 1.00 firmware, plugged in, with an approved memory card (SanDisk 16gb SDHC). I put the firmware file on the root of the card, and the firmware menu doesn't give me an upgrade option.
I've tried two memory cards, plugged in, not plugged in. Formatted. Everything I can think of.
No go. Same goes for the distortion control file.
What gives? By all rights it should update. No help so far from Nikon tech support (thank god their tech support is mentally capable of rephrasing the manual to me as though I can't read).