[Q] Xperia Arc S Root

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http://forum.xda-developers.com – Hello xda forum! I´m kinda noob in the world of custimizing android devices, my first device was a SGA so that was an easy one, but now I have a xperia arc s with the official 4.0.4 rom made by sony the build number is 4.1.B.0 and I want to root it but i can´t, I have tried the DooMLoRD_v1_Xperia-2011-ICS-ROOT-emu-busybox-su.zip method but it failed i think because it requires the build no 4.1.A , the 2nd atempt was to flash a kernel made also by doomlord to put the build number into 4.1.A or somthing like that but it also failed becuse i can´t boot into fastboot mode, so i made a resear (HowTos)