Hm, I own 10 of these things, and I've been trying to update firmware tonight.
I downloaded several different firmware 1.12 versions from the Xiaomi site, per the hardware versions indicated by the serial #s on the back of my Yis.
I rename the correct version "firmware.bin", put it on the root of a blank SD card, and pop it in the Yi connected to power. On bootup, the Yi does the 'firmware updating' beeping only 2-3 times and then quits beeping. When I remove the SD card and check the firmware version, the Yi has not updated. I've tried this on 3 different Yis, each with a different firmware version. No luck so far.
Anyone else having this issue?
Thanks