Originally Posted by Help this company
Q. Can I run the RUU on s-on??? plz find the ruu...
Q. I never heard that doing s-off not using wiretrick. I heard that hboot 1.27 require wiretrick. Is this correct?
the problem is there is no ics ruu for your region so you can't downgrade while on S-ON
that's why you had error155(i think it is bootloader error)
the link i gave you is a new guide for S-OFF(it contains a new tool)
and it doesn't require wire trick
only with S-OFF you can downgrade(there is only gb ruu for your region)
so S-OFF first