[Android Head-Units] erkme73:
Hmm... Well that does throw cold water on my theory. Here is the link to the firmware update zip. It also contains the current (2.89) MCU. http://www.mediafire.com/file/t1j6114v60pg5gk/XRC8.0(20180510).7z

And this is the downgraded (2.84) MCU file he linked to this AM: http://www.mediafire.com/file/p3u6ejsdignt4r4/MTCE_XRC2_V2.84.zip

I'm off to flashing both now... with a little freezer time too. We're supposed to be in the 20's on Friday, so I may be able to skip the freezer routine by then.

---------- Post added at 01:49 PM ---------- Previous post was at 01:19 PM ----------

I don't know what version was part of the firmware image (first link), but stock, my unit had XRC_V2.89. I just installed the 'downgraded' MCU from the second link, and the radio now shows XRC2_V2.84. I don't know what the significance of the 2 is, but I'm hopeful it addresses this issue. I've pulled the unit and stuck it in my freezer.

FWIW, when I turned on the truck for the first time today (just a few minutes ago) the wifi/bt worked immediately. The dash temp showed 80°.

If the radio works coming out of the freezer, I'll be ecstatic. If it works tomorrow morning, I'll consider this resolved (for me at least).

---------- Post added at 02:48 PM ---------- Previous post was at 01:49 PM ----------

]I think we are both on to something. After putting the radio back in the freezer for 30 min, when it came out, wifi/bt was once again (predictably) no loner available. I then rebooted into recovery mode. Upon selecting "reboot system" from the recovery menu, the wifi and BT were up! Up with ICE still on the display and case. To verify, I power cycled the unit and it came up WITHOUT wifi and bt. I again went into recovery and restarted from there, and it came back. 10 minutes later, after everything thawed out, wifi and BT were working regardless of how I restarted it.

This brings up an interesting question...

What is different in how a PX5 starts from a standard power-cycle vs. a prompt to restart from the recovery menu?​

I do not know anything about how these systems boot, but a dev or someone with more experience and understanding might be able to put their finger on what differences could account for these symptoms.

Recovery booting seems to ignore the temperature. And it isn't cosmetic. The wifi and BT actually work despite the frost.

What complicates my installation even more is that I have no hard buttons (other than the reset) - and the touch buttons are inoperable in recovery mode. So, not only can I not get into recovery mode from a power-off state (I have to get into the OS first, then choose "restart into recovery" - an option, which is not available with the stock firmware, BTW. And then, once the recovery menu is up, I can't select or toggle any options. That means I can't pick and activate "reboot to system". When I got to that menu and pressed the reset button, it didn't execute the recovery reboot - so the wifi/BT wasn't working when it came up. I had to connect a physical keyboard to the radio and use that to press enter on the "reboot to system". Only then did the wifi/bt come up.

So, as you can see, while restarting from recovery may be a viable and consistently reliable workaround, it isn't for me since I can't do it without a keyboard and about 5 minutes of wasted time.

Does your radio have physical keys? How do you get into recovery? I wonder if there is a way to get into recovery before it even boots up the first time.

I'd love to share this with the seller but, if I let him know that I'm getting into recovery, that reveals the fact that I'm on something other than stock firmware.