I really like my OnePlus One phone. It is an exemplary engineering achievement proving that it is possible to design a mobile phone as powerful as leading brand’s flagship models but costing half of their price.
Oneplus One is powered by Cyanogen OS, an open source OS based on Android Open Source Project (AOSP). Cyanogen OS has its own update cycles, which OnePlus One receives via over-the-air (OTA) updates. When I bought the phone, it had Cyanogen OS 11 installed, based on Android™ 4.4 KitKat. Pretty much when I turned on, it received update to Cyanogen OS 12, based on Android™ 5. The update went without a hitch, and the phone performed flawlessly for a few months… until the next update came through.
12.1-YOG4PAS1N0 is Cyanogen OS 12.1 based on Android™ 5.1.1.
Unfortunately, once that update installed on my OnePlus One, it rendered the phone practically unusable. The problems included LTE connection dropping out, random freezes and reboots, application crashing, you name it… And after a couple weeks I had enough and decided to do something about that. So, I said goodbye to Cyanogen OS and hello to CyanogenMod Nightly Builds.