If Method 1 doesn't work, you can try installing through the phone's recovery menu.
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Note: The initial boot sequence after upgrading to Nougat can take anywhere from 5 to 12 minutes as the MediaTek chipset optimizes your system cache. Do not disrupt this startup cycle. Troubleshooting Common Installation Errors If Method 1 doesn't work, you can try
The prompt
Because official OTA support has ended, you must use the recovery mode method: If Method 1 doesn't work