My controller won't turn on after I accidentally unplugged it during firmware update. What should I do?

Do the following steps to recover your controller from bootloader mode.
  1. Using a micro-USB cable, connect the controller to one of your computer's USB ports.
  2. From your computer, open the SteamVR app.
  3. Once the controller is detected by the SteamVR app, follow the onscreen prompts to complete the firmware update.
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