Fire 7 2015 [MT8127] [FO5364] [20220219] Android 5.1.1 [OTA]:

1. Connect your Fire tablet to your computer using the included charging cable.
2. Swipe down from the top of your Fire tablet screen and select the USB charging notification, then Transfer files.
3. Open the "Fire" device drive on your computer, then drag and drop the software update file into the Internal storage folder.
4. After the file transfer is complete, disconnect the charging cable from your device and your computer.
5. Open the Settings menu on your Fire tablet and select Device Options.
6. Select System Updates, then Update.
Your Fire tablet restarts during the software update.
The message "Installing system update" appears on the screen after the restart.