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Step 1:
Navigate your left-side menu to the “Settings” option.
Step 2:
Scroll to the right and choose “Device” (Fire TV Stick User)
Scroll to the right and choose “My Fire TV” (Fire TV Stick 4K User)
Step 3:
Scroll down the pop-out menu until you reach “Reset to Factory Defaults” and select it.
Step 4:
If you have a pin code set for your device, you will need to enter it now when prompted.
Step 5:
Choose “Reset” and allow the system to restart.
Step 6:
You will now be taken completely through set up as though the device was just plugged in for the first time.
****Please check the next article for step by step guide to register your Fire TV Stick.****
What's gonna happen after Resetting to Factory?
Remove Apps and App Data:
(Performing a factory reset will delete all of your installed apps & the data associated with those apps. This includes both official apps downloaded from Amazon App Store and 3rd Party App (External APK).
Games:
Some games will save the progress to Amazon’s cloud servers. Reinstalling those games after a factory reset will restore the progress.
Disable ADB:
Performing a factory reset will disable ADB access. If you’ve rooted and modded your Fire TV and face some issues, think twice before performing a Factory reset. Factory reset will disable the ADB and close the best ways you have to fix your issues.
Re-Enable Updates:
Performing a factory reset will re-enable updates. if you’ve disabled them using the “pm disable” method. This is why it is a good idea to also block updates in your router. This is not much of an issue if you are running ClockworkMod custom recovery since a stock update that gets downloaded will not be installed upon rebooting anyway if you have ClockworkMod installed. That said, the first thing you should do after performing a factory reset is to re-disable updates.
Force Initial Setup Process:
Performing a factory reset will cause you to go through the initial setup process again. This is important to realize because the Fire TV or Fire TV Stick will try to update during the initial setup. Depending on the software version you are running, the device may refuse to complete the initial setup without updating. A Fire TV that got through initial setup fine with updates blocked won’t necessarily do it every time.