problem after updating firmware CQ 8900

I have a CQ 8900 with firmware non conect key 071.160.202.26500 and the tecnical update to 072.161.216.30801, after this upgrade the smf workflow don´t work anymore.

I have 2 machines with the same configuration and that have the 071.160......work fine the new frimware don't work.

Can I do a downgrade, and how or somebody already have that problem and have a solution.

thanks

carlos