Firmware Upgrade: Am I missing something obvious??

I feel like I’m crazy right now. Booted up the old windows box found a copy of DfuSe. Down arrow + power on, Nano in Dfu mode, drivers install fine. Update uploads fine and “Verify Successful” and everything looks fine. Restart nano and the same stock firmware. I’ve tried DfuSe 3.0.0 and 3.0.1.

No matter what I do, it says it upgrades fine and boots back into the stock firmware.

Am I missing something obvious here?

Thanks in advance guys!

dfu-util in Ubuntu worked great. Looks like an issue with Win 7 64-bit.

thanks, indeed on win7/64bit i had the same experiance.
win7/32bit worked fine