If for some reason you want to rollback to CM11s from CM12 on your OnePlus one android smartphone, here is the step by step guide which you can follow on your phone and go back to the older version of Oneplus one CM11s. Most of the CM12s facing lots of problem like poor battery life, touch issue and lots more. And many of them want to downgrade their phone, by this guide you can do this easy ands solve all your problems. This method will wipe your device and restore it STOCK CM11s. Please backup your data.
Your warranty is void if you follow the given instruction in this guide. We the Howtorootmobile.com team or the developers are not responsible for bricked devices, dead SD cards. Read all the instruction very carefully and Perform everything at your own risk.
CHECK PHONE MODEL
This guide is only for the Oneplus One android smartphone. Don’t try this method on any of other Android devices, It may hard brick your device. So, first confirm your phone model number in your android phone settings. To do this Go the Settings page of your device and check out the “About Device” option.
PRE-REQUISITES AND REQUIREMENTS
Before following the below Mention guide, It’s always recommended to follow our pre-requisites and requirement to stay safe.
1. BACKUP YOUR ANDROID DATA
Do take the Full Backup of your Android Apps, SMS, Contacts, Call Logs, Bookmarks. This one is one of the most important steps that you have to follow, as we don’t want anyone losing their personal data or apps. For help on Backup and Restore check out the below mention guides.
3. ENABLE USB DEBUGGING MODE
Now you need to enable USB debugging mode. Without enabling USB debugging mode on your device you can’t start the root, Custom ROM or Unlock process.
4. CHARGE YOU ANDROID
If your device switched off during this process, it could damage or brick the device. Make sure that your Android battery is full charge or near about 50-70% battery level.
After following the above mention steps follow the below mention guide one by one to proceed with the tutorial. All the above mention steps are very important, so do follow all the steps and do exactly what is told.
ROLLBACK TO CM11S FROM CM12S
Step 1. Download the CM11s stock fastboot rom zip file from the below mention links on your desktop, unzip and keep it on your desktop.
Step 2. Install the Latest ADB drivers on windows pc here.
Step 3. Boot your phone on fastboot mode. (Disconnect the phone from the computer if connected power off your phone, hold VolumeUP+Power button simultaneously till you see fastboot.)
Step 4. Once your phone in fastboot mode. Open the Stock ROM unzipped folder on your desktop, Depending on phone version run the .bat file with a double click 16gb Model or 64gb Model.
Note: The script will unlock the bootloader first before installing the CM11s. Just follow the on-screen instructions. If the phone reboots after unlocking the bootloader then just disconnect the phone put it back to the fastboot mode and connect the script should continue installing the CM11s.
If you already have unlocked bootloader there will be no interruption the script will install the CM11s and the phone will reboot into STOCK CM11s.
That’s it. Now your phone is running on the CM11s ROM.