[Brad from the OC]

Originally Posted by Kalud

Yearly bump!, everyone with the ALL button can get the REST feature coded, the opposite is not true unfortunately...

See:

http://www.e90post.com/forums/showthread.php?t=497347

If you have an older model and have the REST feature, you can enable the ALL function without coding or other highly technical patches. I simply just join the two temperature control knobs together with a rubber band. With this simple fix, you have both the ALL capabilities and the REST feature also!