latest airport extreme would not update software from 7.7 factory installed to 7.7.1. keep getting an error of "An error occurred while downloading the firmware"

i have tried MBA, Ipad and Ipod touch and still getting the same response. tried to reset and update the firmware as well but no luck, it is the latest Airport Extreme

ok here is the overview after reset several times.

i get this below screen when click on AE icon on airport with 1 in red circle.

then i get this below screen once click on older version dialogue box of "Older Version" notice the current version is 7.7.1 with check mark instead 7.7

then i get this below screen once i hit current version number and return back.

(Note: it is stated current version is now 7.7.1 above the download and install button which conflict with current version 7.7 stated next to gear icon)

if try to download i receive this message below

and if hit ok then airport utility closes automatically.

and after restarting utility i see 1 in red circle and if try to update as suggested get this screen

note the version stated here is 7.7 if try to update then back to very first pic again.

HELP!!!!!!!!!!!!!!!!!!!!!!!!

airport utility showed me these screens. this time able to post figs. but was able to update the software after couple of resets

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