OK I have successfully downgraded another psp which was initiallay 2.01 with IC6001 motherboard.
From the feedback so far, I think it is safe to say that IC6001 can be downgraded with no problems.
I did however upgrade to 2.00 and then use the MPH downgrader to go back to 1.5 again, just to be sure, and it worked like a charm.
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