OnePlus One: How to Fix Issues Caused by Previous Cyanogen 12 OS Update, Download the New Cyanogen OS 12 YNG1TAS17L rooted/cleaned ROM

By Staff Writer

May 06 2015, 11:19 AM EDT

The OnePlus One smartphoone recently received the highly-anticipated CyanogenMod 12s OS upgrade, bringing all the key features of Android 5.0 However, a number of issues have been reported to have been experienced after the upgrade.

Several OnePlus One owners have reported overheating and battery drain. While Cyanogen tries to address the issue, it has been recommended to downgrade the OS back to Android 4.4.4.

The downgrade has pre-requisites to be satisifed:

TWRP or ClockWorkMod custom recovery has to be pre-installed
Battery has at least 70% of battery charge
Enable the USB debugging option (via the System menu)
Data has to have been backed up

To downgrade do the following:

Download the necessary ROM files: CM11s 33R file, Android v4.4.4 KitKat for OnePlus One, OTA update for 33R to 38R, OTA update for 38R to 44S
Copy the files and paste them to the internal storage's root directory
Turn off the tphone, then press and hold the power and volume down simultaneously
The device will restart in the Recovery mode; click on Wipe then Advance
Wipe cache, system, user data and Dalvik Cache
Install the zip file and ignore any error message prompts
Reboot; take note that the first boot will take time
Once the device starts, reboot to Recovery Mode again and flash the files according to downgrade order

A number of other issues have been reported, with various solutions or workaround created for them.

In the meantime, the Cyanogen team has resumed the OTA update for OnePlus One with the new build YNG1TAS17L that addresses the issues of the previous update, and adds Ok OnePlus voice activation functionality.

To install Cyanogen OS 12 YNG1TAS17L rooted/cleaned ROM, do the following:

Download Cyanogen OS 12 YNG1TAS17L rooted/cleaned ROM for OnePlus One. There will be two files: rooted only and root + cleaned + moded
Connect the OnePlus One to a PC via USB cable. Copy the downloaded file to the root directory of the phone's internal storage
Disconnect the phone from the PC and turn it off
Boot the phone into recovery mode by pressing Volume Down and Power keys simultaneously
In recovery mode, select wipe data/factory reset and also wipe cache partition
Click advanced options and wipe cache, dalvik cache, data and system partitions
Return to the main recovery menu, select install zip from SDcard
Choose zip from SDcard.
Locate the saved rooted ROM, select it and confirm installation
When the installation process is complete, return to the main recovery menu and reboot the phone by selecting reboot system now

The OnePlus One was released last June and originally came with Android OS, v4.4.2. This 5.5-inch phone measures 152.9 x 75.9 x 8.9mm and weighs 162g. It also has a 13MP main camera and a 5MP secondary clicker, and a non-removable Li-Po 3100 mAh battery.

Under the hood, it has a Qualcomm MSM8974AC Snapdragon 801 with a Quad-core 2.5 GHz Krait 400 CPU, Adreno 330 GPU, and 3GB RAM. Its non-expandable internal storage has two variants: 16GB and 64GB.

Hopefully, the tips posted here would help resolve any issues users have with the OnePlus One, and allow a successful download of the newest clean version.