Software update for the AT&T Beam (AC340U). Update & verify software. Insert your AT&T Beam into your computer. Connect to the Internet. From the AT&T AllAccess program, select the Settings icon. From the Update tab, select Check. Follow the on-screen prompts to download and install the update. Open AT&T AllAccess. Select Settings > About. Your device has the latest software if the Firmware version matches the current update details.
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