Error en ipkg install buildroot

Hola.
Tengo un router wl-520GU y cuando intento que se instale el buildroot me da el siguiente error:
[admin@AsusWL520GU opt]$ ipkg install buildroot
Installing buildroot (4.1.1-13) to /opt/...
Downloading http://ipkg.nslu2-linux.org/feeds/op...-13_mipsel.ipk
Nothing to be done
Successfully terminated.
Collected errors:
Package buildroot md5sum mismatch. Either the ipkg or the package index are corrupt. Try 'ipkg update'.
[admin@AsusWL520GU opt]$

Ejecuto la orden ipkg update


[admin@AsusWL520GU opt]$ ipkg update
Downloading http://ipkg.nslu2-linux.org/feeds/op...le/Packages.gz
Inflating http://ipkg.nslu2-linux.org/feeds/op...le/Packages.gz
Updated list of available packages in /opt/lib/ipkg/lists/optware
Successfully terminated.
[admin@AsusWL520GU opt]$

Y vuelve a salir el mismo erro.
¿Que solución podría darle?
Saludos

Sorry for english, I'm from Russia and find your question via google search.
Have same result after try to install buildroot via ipkg.

By mistake press link on your post and see file size is about 42Mb. But at cache of my ipkg is only 10! So, just wget -c it to router and install from local.

wget
buildroot_4.1.1-13_m 100% |*******************************| 42247k 0:00:00 ETA

[......]$ ipkg install buildroot_4.1.1-13_mipsel.ipk
Installing buildroot (4.1.1-13) to /opt/...
Configuring buildroot
Updating /opt/etc/ld.so.cache
Successfully terminated.

All ok. :)