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If you're not using FireStarter try toggling ADB Debugging off then on in your Fire TV developer settings.
FireStarter, unfortunately, has been blacklisted by Amazon and is no longer compatible with adbLink. If you are using a hacked version, it will cause "device "offline", so you will need to force stop it, then toggle ADB Debugging off/on in your Fire TV developer settings.
If you have questions or comments, please email email@example.com. adbLink produces a log file, adblink.log, with each run. Include it in your email or post if you're having problems.
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