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If an update has already downloaded and is waiting to be installed, it is best that your device is still on. If you can’t establish an ADB connection without the internet being live, just be sure to block updates as fast as possible once the device is rebooted. That way you can run the update blocking commands without worrying about the update downloading. This should allow you make an ADB connection to your Fire TV or Fire TV Stick even though there is no actual internet connection.
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You should disconnect the coax cable or phone line from your internet modem, but leave the modem and/or router powered on. Read my update blocking guide, restart your device, and perform update blocking method 1 (on a rooted device) or method 2 (on an unrooted device) of that guide once your Fire TV or Fire TV has booted back up. If the update is still trying to download or an error message is displayed, then you just need to block software updates before the update has a chance to fully download. If it says “An update is available” at the top with a message asking you to “Press SELECT to install now,” then you need to move to the “If the update has already downloaded” section of this guide below. Verify that the update has not finished downloading by going to the device’s Settings > System > About menu and scroll to the last option. If your Fire TV or Fire TV Stick is still powered on, do not turn it off. Kill the internet connection immediately by unplugging the ethernet cable from your Fire TV or by turning off your WiFi.
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