Somewhere in the history of the 3.0 there was a change which also affected the child safety unlock procedure. I think the old way was hold feet up and down for about 6 or 7 sec until the backflight flashes and stops. The new way is to press and hold head up and head down for about 6 seconds till it flashes, then do same on feet - feet up and feet down for 3 sec until it flashes. if whichever wag you tried didnt unlock it, then try the other method. If neither way works lol, then try holding head down and zero g button for 3 sec, and then head up and zero g for about 3 sec until it flashes. Hope one of these works! More on reddit.com

I've never seen your bed, but fixed a friends adjustable bed (not sure of the brand) when a disgruntled ex cut the wires. In his, the piston that drives the movement is held on with a cotter pin. Pulling that out allowed the bed to lay flat. Its not a true fix, but is quick and easy if you want the bed flat to sleep on. More on reddit.com