7.5.2 firmware update causes samba read performance to be slow.

Anybody has a resolution for following problem. With 7.4.1 I had an acceptable wireless speed to my macbook, from 2 different samba mounts directly connected to the airport extreme: one nas over gigabit, one linux machine on 100mbit.
After updating to 7.5.2 the write performance is still good but reading from either the nas or the linux machine is a factor of 100-1000 slower then the write performance.....
Does anyone has a link to download the old firmware (7.4.1)? which seems not to be downloadable from the support page.
Any tips or tricks?

In Airport Utility, click to highlight your Airport Extreme. In the right hand side, click on "Manual Setup". In the summary tab, place your mouse pointer above "Version" in the version number area. You will see the word turn into a link (gray highlight with a little arrow inside it). Click on this and a drop down menu will appear which will let you revert to a prior firmware version.

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