Downgrading Airport Express 2nd gen. to 7.6.1

Hi there,
I've just acquired another Airport Express today, 2nd gen., replacing a 1st gen. (n draft version) because of dual-band capabilities. Like other people, I have trouble with firmware 7.6.4 when playing music over AirPlay and optical to external DAC (see e.g. https://discussions.apple.com/message/19806591). I hear frequent high-pitch high-volume glitches, which ruins the listening experience. My 1st gen. could downgrade to 7.6.1 through AirPort Utility, but I can't do that with the 2nd gen. The message is "The selected firmware file is not compatible with this AirPort base station." I got the file as detailed on this site: http://www.laszlopusztai.net/2013/02/11/downgrading-airport-extreme-to-7-6-1/ (I tried all of them called 7.6.1.)
TL;DR: Is there any way to downgrade AirPort Express 2nd gen. to firmware version 7.6.1 so that optical out to a DAC works again?
Thanks!

Tks for the info.
I read tons and tons of posts here... have the same problem : can't downgrade from 7.6.3 to 7.6.1 because my airport express has been shipped with the 7.6.3 firmware version (how lucky ! ;-(
And no way to manually install the 7.6.1 binary as well (found here : http://www.laszlopusztai.net/2013/02/11/downgrading-airport-extreme-to-7-6-1/ see comments) when using the option key (option "Other").The install failed.
So, no solution at all ?? This is crazy !
Message was edited by: Fredolinho
Message was edited by: Fredolinho

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http://support.apple.com/kb/HT5606

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What model and firmware is the 2TB TC?
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Signal can only be extended that is received intact.
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1. Fix the wireless name, make it short, no spaces and pure alphanumeric.
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3. Get real results from the AE in its current location for signal strength.. this is really only possible on v5 utility. And that is a double pain with Mavericks because you cannot use it.
Apple have removed all the useful diagnostics from the airport utility. There is next to nothing left. So you need to use the computer and its diagnostics to find signal levels in the location.
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