Is it save to try with SKIPROMUPDATES scsi.device? What if his HDD is on scsi.device? Maybe it would be better to just boot with no s-s and type "setpatch" to see what output you get. Remember that the default OS3.5/3.9 setpatch line in the s-s includes the "quiet" switch, which is why you don't get any output (even if it hangs or errors). Typing it from the CLI without the QUIET switch will allow you to see whether setpatch is successful.
Also, as I have said, cutting pin 1 of the HDD cable will not help in this case (now I understand fully what the problem is). However I would like to point out for the record that I had pin 1 cut on my old 3.0 A1200 and never had a single problem with it.
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moto