Wiki page said,

[PaS3]

Wiki page said,

Options

If you'd like to set a different GPU/ARM memory split, then define gpu_mem in /boot/config.txt.

To upgrade/downgrade to a specific firmware revision, specify its Git hash (from the https://github.com/Hexxeh/rpi-firmware repository) as follows:

sudo rpi-update fab7796df0cf29f9563b507a59ce5b17d93e0390

but there is no list of possible hashes ?

I could generate something like a sha1sum git commit contents with date/version history ( echo "$(cat /boot/kernel7.img) $(date)" | sha1sum )
but not sure what is the date and version history.

Please help.

[pelwell]

The hashes are on this page: https://github.com/Hexxeh/rpi-firmware/commits/master

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[PaS3]

Thanks, it may have been my dns configs.