Bank A is corrupt or empty. There are two boot banks to allow for quick rollback in case a firmware upgrade causes problems. Only one valid firmware image is needed for the media gateway to function.
Upload a firmware image to a file server and use the "copy scp SW_imageA" command to download it. You can also load firmware locally off a USB drive. Use "copy usb" in that case.
The "set boot bank bank-a" command will mark Bank A as the primary boot bank. This takes effect after reboot.
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