[Guide] Install CM12.1 fastboot zip in OnePlus One

CM 12.1, CM12.1 for OnePlus One, CM 12.1 OTA, CM 12.1 OTA Update, Cyanogen OS, CyanogenMod 12.1, Android Lollipop 5.1.1, CM12.1 fastboot zip, CM12.1 YOG4PAS3JL

A noob friendly guide to Install CM12.1 fastboot zip (YOG4PAS3JL) in OnePlus One

Attention OnePlus One users, Cyanogen is already rolling out CM12.1 YOG4PAS3JL OTA. But some users having TWRP recovery and they are facing some problem to install OTA updates. If you want to revert back to stock CM12.1 firmware and Cyanogen recovery, then here is the guide to install CM12.1 fastboot method.  The new Cyanogen OS 12.1 update brings some security fixes and improvements. After flashing CM12.1 fastboot zip you will lose your rooted status. Let’s start flashing CM12.1 fastboot zip step by step.

Step 1: Install Fastboot driver on your PC and OnePlus One.
Step 2: Install the OnePlus One USB driver for Windows 8.1 64 bit PC and all other PC.
Step 3: Download the latest CM12.1 YOG4PAS3JL build firmware fastboot zip from official link: Click Here (It’s around 653.36 MB).
Step 4: Extract the CM12.1 fastboot zip firmware file via any zip extractor.
Step 5: Open the command prompt (window key+R) and open the folder where you extract the CM12.1 fastboot zip.
Step 6: Switch off your OnePlus one and reboot it in fastboot mode by the following steps:

  • Switch off your OnePlus One and wait for 4-5 seconds.
  • Press and hold Power + Volume Up buttons for 4-5 seconds enter in fastboot mode.

Step 7: Now connect your device to computer.
Step 8: Now test whether fastboot mode is working properly or not by following command:
fastboot devices
If you see the text “fastboot” with a serial no. displayed after it, then the fastboot is working fine. Else re-install the fastboot driver as in step 1 and step 2.
Step 9: Now verify that the bootloader status on your device’s screen, whether it says locked or unlocked. If it’s unlocked, then go to step 10. If it says locked then unlock the bootloader via following command:
fastboot oem unlock
Then, choose Yes to confirm the action and let the device reboot. After this unplug the device from the computer. After the device restarts, boot it into fastboot mode again.
Step 10: Run the following commands one by one to install the Install CM12.1 fastboot on your OnePlus One. You should wait until every command is finished, before entering next command:

  • fastboot flash modem NON-HLOS.bin
  • fastboot flash recovery recovery.img
  • fastboot flash sbl1 sbl1.mbn
  • fastboot flash dbi sdi.mbn
  • fastboot flash rpm rpm.mbn
  • fastboot flash aboot emmc_appsboot.mbn
  • fastboot flash tz tz.mbn
  • fastboot flash LOGO logo.bin
  • fastboot flash oppostanvbk static_nvbk.bin
  • fastboot flash boot boot.img
  • fastboot flash cache cache.img
  • fastboot flash system system.img

Note: The last command will take around 20-30 minutes. Sometimes it may take around 50 minutes so don’t panic.

Step 11: Now, if you want to clear all user data then enter the following command for OnePlus One with 16 GB storage:

fastboot flash userdata userdata.img

For OnePlus One with 64 GB storage you should use following command:

fastboot flash userdata userdata_64G.img

Step 12: And now the final command to reboot the device for the changes to take effect:

fastboot reboot

That’s it folks! Your OnePlus One will now be running on latest stock CM12.1 ROM. if you want to root your device then just flash latest superuser.

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