Enable Developer Options
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Follow these steps to make the Developer Options appear again:
1. Select FireStick Settings.

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2. Click My Fire TV. (If you do not see My Fire TV you may have to click Device & Software)

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3. Click About (only if you DO NOT see Developer Options on this screen).

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4. Highlight the first option on the list, which is usually your device's name, and click it quickly 7 times.

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5. You will see a notification at the bottom saying No need, you are already a developer. That’s it, you have enabled Developer Options.

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6. Press the back button once or go back to Settings > My Fire TV and you will now see Developer Options.

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7. Click on Developer Options and click on Apps from Unknown Sources and turn it ON
