I have been using 167 for several weeks and have noticed a couple of things that may or may not be related to it. Firstly, my bullet forgets my temperature and volume selections when I turn the power switch off. This never happened before I moved to the new firmware. Secondly, and this might be a case of the comical side of the dead man switch, a couple of days ago while I was roasting some Mexican beans in my R2 Pro and when the roast reached my ending temperature of 435F I opened the door and hit PRS. Well, a split second before I hit the button the dead man switch sent an alarm, so the button press silenced the alarm but didn’t end the roast. I had to hit it a second time. My beans were already in the pan and had been dropped at 435F, but the fan and stirrer weren’t running. On the second push they started and my roast ending temp was logged as 439F. None of this caused a problem other than my roast logging an incorrect ending temperature and development time. I wish there were a way to go back into the roast and correct those two entries, but I haven’t found a way. As I said, I don’t know if either of these two things is related to firmware 167.
I found the statement listed below by doing a Google search concerning FW-167 for R2/R2-Pro roasters, so I guess it isn’t my imagination. For now, my best bet is to revert back to FW-159 to avoid having to reset those values every time I turn the roaster on, albeit with some loss of other functionality. I’m fairly confident that the timing of the dead man alert was just a random thing and not a firmware specific issue.
The persistent resetting of speaker volume and temperature units on your Bullet R2 Pro after power-off is a known bug introduced in firmware version 167.