Through a painful process of bisecting, I've found that r356 is the problematic release. r355 boots my phone fine, but r356 hangs at the vendor logo. In all cases I did a completely clean reflash. So now I'll pick apart the r355-356 delta and see what might have changed, and also verify that flashing to r355 and upgrading to r356 demonstrates the problem.
Through a painful process of bisecting, I've found that r356 is the problematic release. r355 boots my phone fine, but r356 hangs at the vendor logo. In all cases I did a completely clean reflash. So now I'll pick apart the r355-356 delta and see what might have changed, and also verify that flashing to r355 and upgrading to r356 demonstrates the problem.