Procedure to Update Karbonn A9+ / A21 with Nokia X Firmware:
- Download the Nokia X ROM from here to your computer. Once downloaded, connect your device to the computer with the help of original USB cable and then place the downloaded zip file in your Karbonn A9+ / A21 smartphone.
- Reboot the device in the recovery mode or the TWRP mode with the help of ROM Manager or manually.
- Up next, you need to select the option of Wipe Data and Wipe System Cache from the recovery mode.
- Select Mount System and Data to install the firmware zip file placed in the device and then reboot the device for firmware installation.
Note: If at all your Karbonn A9+ / A21 smartphone gets in the boot loop mode, then you need to turn off the device and then reapply the update from the start. To turn off you can reinsert the battery or say you can long press the power button and repeat the whole process again.

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