Updating airport express firmware

I received an error message when updating the Airport firmware. -6,721 I can't get it to update after numerous tries.It happened after I tried to connect to another Airport while it was installing.And, of course, remember to check for firmware updates regularly—the Air Port Utility checks automatically once a week—because they're often important.

Without firmware telling your gadgets what to do, they wouldn't work at all, and that's exactly what makes firmware security problems so serious.Similar error while attempting to update the Airport Extreme (model A1521) firmware to version 7.7.7. Removed all connections to APE, repeated above steps with identical outcome.After clicking "update" for the APE in Air Port Utility app on my MBP, it looked like it was downloading and then restarting, but then the "error occurred while updating the firmware" message popped up. Checking out the physical APE, it's got a fast flashing amber light on. Attempted to connect ethernet cable to all ports, one at a time, to MBP and then into a port in another router. Removed rubber base from bottom of APE to inspect physical reset button connection with ohmmeter.The firmware had already downloaded so I thought that was ok.I had installed the firmware on other Airports on separate networks without issues using the same laptop just before.

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