4.3 ROM for Galaxy S2

[GuilhermeGS2]

I got a question, I hope anyone can reply quickly: I updated my firmware by kies to a most recent build, but the root that I made was deleted. My old fimware was "XXLS8", and now I updated to "UHMS1" that I think exist only in Brazil. I don't found any way to root by Recovery Mode (as I made before) for this firmware, I just found for "UHMS8", and I don't know if is compatible. I did root using the "PhilZ" based in stock kernel. My real doubt is: can I install the last version of Siyha kernel in any JB firmware? As I read, this kernel was made for only Samsung JB ROM (the last update v6). Please help, I'm going to wait a quick reply still today, if anyone can help me.