taddlock wrote: 100% agree Kit Kat just took my HTC One back about 10 years ... everything locks up, camera will not function correctly, it can't even do the basics any longer.  Phone sits and does nothing ... all the time draining the battery in record time.  How do I un-update back to the previous version?

I find it fascinating, and puzzling at the same time, that some HTC One phones got the update, and all is well, even improved.  Others seem to have been royally messed up by the update.  Why does it work on some phones and not others?

We got the One late last year, and it did get a small update soon after we got it.  The camera has been very inconsistent, as stated - purplish (or yellowish) tones in low light at times, but not always.  Otherwise it's been a nice phone. 

KitKat was pushed, installed, and so far the camera function seems improved, Google wallet and tap to pay works, battery life is the same (1-2 days on a full charge) ... no problems connecting to wifi or bluetooth ... maybe we are just lucky?

I suppose we could compare installed apps and general usage patterns to see what differences there are ... one thought that does occur to me - how much free space is there on your device?  Ours has about 13 of the 32 GB used, leaving over half available.  If there is not a lot of space available, it could cause issues (just like a computer if the hard drive has less than 10% free space.)