If he removes A9LH and his console doen't boot. Brick. Caution.RIIIIIIDDDDGGGGE RACCCERRRR!!!!! *coughs* sorry.
The best i got is restore your SecureInfo_A, so line 100, first byte to the one listed as. And then put a 2.1 eu ctrnand transfer. Then remove a9lh. Then redo a9lh and update using a 9.2 eu ctrnand transfer. If that doesnt work well, I think you bricked.