Once the update completes, you will need to select reboot system now by pressing Power button once again. Now select update.zip using Volume button, then press Power button to initiate update process. In the update interface, you should see update.zip file (or file name which you placed in second step above.). 
Press Power button to enter update interface. 
When in recovery, Use Volume up/down buttons to select options in the recovery mode. Keep holding the Volume Up + Power buttons until you see a splash logo or an Android robot. Without leaving the Volume Up button, press and hold Power button too. Turn-off your phone and boot into recovery mode following the way below. Or if your phone doesn’t have that option, you can proceed to next step. > Phone’s settings > System Update > Update via SD Card If your Android smartphone has the option, you can go through 
Many vendors provide an option in their Android user interface to use SD card to update software/firmware.Copy the file to micro SD card in root directory.Make sure the file you use must be named as update.zip so rename it accordingly if needed. If it does, extract the file and use the residing zip file instead of the one you downloaded. WinZip or WinRAR and verify that it does not contain another zip file within. You must open the file in an archive reader e.g. Note: The file you download may have custom name such as xyz.zip. zip but must be checked before proceeding. The firmware image or ROM file might be in any archive format such as. It could be TCard or TF Card as well depending upon vendor.
Download the SD card version of firmware upgrade. A TF/SD Card, usually a micro SD card to be used with the smartphone. The upgradable firmware / ROM file (update.zip) downloaded from the official website of the device manufacturer. A never-rooted Android device that you want to upgrade. This way of upgrade is official and the upgradable firmware image file is provided officially from the vendor hence doesn’t require any extensive knowledge of flashing. Or the process of updating can be started from the stock recovery. Users just need to put the firmware image file usually named as update.zip into the SD card or TF card and begin the process of updating from within the system settings while the phone is running. One of which is the use of SD card or TF card. There are many ways Android users can upgrade their smartphone.
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