If you do not want to wait for the OxygenOS 2.2.1 OTA (over the air) update, you can install it manually. Before you start, you might want to know the whole changelog of this new system update. OxygenOS 2.2.1 is an incremental update and just weighs 241 MB only. Below are what is new in this update. The below guide explains how to install the new OxygenOS 2.2.1 OTA update manually on OnePlus 2 (with stock recovery or custom TWRP recovery). Note that this is an incremental update, so your device should be running on OxygenOS 2.2.0. to apply the update.

How to install OxygenOS 2.2.1 OTA update on OnePlus 2 Manually

  1. Download OxygenOS 2.2.1 OTA Zip file [HERE] [Source] and save it on your phone’s internal memory.
  2. Boot your OnePlus 2 into stock recovery by pressing and holding Volume Up and Power buttons together.
  3. Select ‘Apply update’, browse for the zip file that you saved in step 1, select it and confirm installation.
  4. Once done reboot your phone. For OnePlus 2 with TWRP recovery
  5. Download OxygenOS 2.2.1 OTA Zip file and save it on your phone’s internal memory (Link in the above step).
  6. Boot your OP2 into TWRP recovery (use Volume Up and Power key combinations)
  7. In recovery, select ‘Install’, navigate to OxygenOS 2.2.1 OTA Zip file and swipe right to flash.
  8. Once done, reboot your phone (source)