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Not so long ago the OnePlus development team rolled out the latest Oxygen OS 3.5.6 OTA update to the OnePlus 2 based on Android 6.0.1 Marshmallow. It is a huge upgrade that brought critical bug fixes and performance improvements to the camera app, WiFi, battery life, and some kernel tweaks. However, the OOS 3.5.6 also got some dislikes due to some bugs that still prevails with the update. For those who found the Oxygen OS 3.1.0 to be more stable, reverted back to it just to find out that the OnePlus 2 device lost the IMEI 2 for the Sim 2 card slot. OnePlus 2 development team released another hotfix update to fix the lost in IMEI issue with Oxygen OS 3.5.7.

The Oxygen OS 3.5.7 endorse the same upgrades as that of Oxygen OS 3.5.6 with an added functionality to fix the lost IMEI and also a seamless upgrade to the latest Android 6.0.1 Marshmallow firmware with December security patch level.

Features and screenshots of Oxygen OS 3.5.7 for OnePlus 2:

  • Based on Android 6.0.1 Marshmallow
  • Fixed persistent network drops
  • Added VoLTE functionality
  • New App Lock
  • New Battery Saving Mode
  • New Gaming Mode
  • General Bug Fixes including network issues and VoLTE issue

Download OXygen OS 3.5.7 for Onelus 2

How to fix lost IMEI 2 in Sim 2 on OnePlus 2 via Oxygen OS 3.5.7?

If you are already on the official Oxygen OS 3.5.5 or the Oxygen OS 3.5.6 with the lost IMEI on OnePlus 2, then all you need to do is flash the OTA patch or full firmware listed below and upgrade to Oxygen OS 3.5.7. This will also work on the Oxygen OS 3.1.1/3.1.0. Check out all the procedures on this page for OnePlus 2(Oxygen OS 3.5.5) or you can make use of the OnePlus 3 post as well.

Download OnePlus 2 Oxygen OS 3.5.7 full stock firmware

  • Oxygen OS 3.5.7 for OnePlus 2 full ROM → Download | File: OnePlus2Oxygen_14_OTA_028_all_1701052113.zip
  • Oxygen OS 3.5.6 for OnePlus 2 OTA → Download link listed above

Here is how to install firmware upgrades on OnePlus 2? Simply grab the firmware file fro above and manually flash it using stock recovery. First, transfer the update file to internal storage, and then boot into the stock recovery. Now hit “apply updates from storage”. Select the update file and proceed with the installation. For a detailed tutorial on using stock recovery, head over to this tutorial: How to Install Oxygen OS OTA Update on OnePlus devices with Stock Recovery. Alternatively, follow this guide (Method one there): How to Install Oxygen OS OTA Update on OnePlus devices with Stock Recovery. This method may not work with every OnePlus device.

Alternatively, if the above method fails then you have the option to flash the OTA using ADB sideload method. This is the manual method for installing the OTA zip file on most of the Android devices. For this method to work, you need to setup ADB and fastboot environment on your PC, connect your device via USB, and enter “adb sideload <filename>.zip” command via terminal or command prompt.  To install OTA update via ADB sideload, download the file from above and head over to this tutorial for detailed steps: How to install OTA updates on Android device using ADB sideload method?

More OnePlus 2 tutorials:

Source: OnePlus