Here is a book that explains the entire process of changing consoles:
Why this is not sent out with every single machine remains a mystery.
I think this will answer your questions...
On 10/26/2012 2:10 PM, Roberto José Etcheverry Romero wrote:
I've seen some cases where new POWER systems come pre-tested from IBM
configured to use HMC and it was a pain to change back. Now, how do
you change the service processor to stop being managed by the HMC? (in
this case i have a 525 with 1 partition that i want to move beyond the
reach of the HMC that used to control it). I think it had to do with
doing a factory reset on the ASMI but i figured i'd rather ask first
before having to re-configure the Service Processor...