The "Jailbreak" is one .pem file.
/etc/uks/pubdevkey01.pem
/etc/uks/pubprodkey01.pem
/etc/uks/pubprodkey02.pem
One could remove it, Or flash the device (as above) to a completely cleans state.
Many came with "uninstallers" - in this case it would simply
Quote:
mntroot rw
rm -f /etc/uks/pubdevkey01.pem
mntroot ro
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Or similar.