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From Planet Computers
→Android 8.1 manual update for Gemini 4G (x25 and x27)
In File Manager, browse the Download folder inside the Internal Storage to reveal the downloaded ota.zip archive. Make sure that the file you just downloaded was not been saved with a different file name. In that case rename the file to ota.zip.
Please note that if you already have a file called ota.zip, then the just copied file will be renamed with an extension. In that case, please remove the ota.zip file in the root folder of your Internal Storage and copy/paste the file again.
Now that we copied the update archive in the correct location, we need to start the update process. Inside Settings, scroll to the bottom and tap on 'About phone'.