Recently picked up an Acer Liquid Zest Plus Model T08, Part #HM.HVSAA.04, with the matching original flipcover.
Overall, very pleased with it. However, I have 1 strange behaviour, I cannot figure out. When the flipcover is closed, and it shows the various info through the cutout, I wonder WHERE it get's the temperature from ? It seems to be stuck at 20ºC and no matter what, it doesn't change.
Ive enabled "location" features to ensure the included "Digital Clock and Weather" app can get a location (really would be better to offer either location setting, OR manual setting of a location. Location settings suck battery, and often many people prefer to keep them off. If you don't travel much, a manually entered location for weather is plenty for most). Anyhow, the launcher widget for Digital Clock and Weather on my phone DOES properly show the proper date/time/location/weather/and temprature. Yet the temperature on the "flipcover" app is still stuck at 20ºC (68ºF). I assume the 20ºC is the default flipcover app initialization value.
So bottom line is: WHERE does the FLIPCOVER system app (responsible for the flipcover open/close) activities , get it's temprature that it displays from ?
I've tried to clear DATA from various apps I can think of (in case of curruption), from the launcher (Acer Liquid Home), Digital Clock & Weather, FlipCover, and a few others which were probably unrelated.
Also when checking the Digital Clock and Weather app permissions, I noticed there was "Location" and "Storage" options. Location was approved (since it asked for permission when I set it up first time), but storage was not enabled. I went ahead and enabled it, in case it was an oversight and it maybe needed to write out the info to a file which maybe flipcover would read from, but it made no difference...
Even made a crazy assumption that it was using an internal sensor reading from the phone for ambient temperature, so I took it out on the porch (where is is presently 0ºC) and it still did not budge. 
Any help would be appreciated.