First of all u hav to unlock.ur bootloader ....this can be if ur date on battery is less than or equal to 11w29.....check the forum for unlocking bootloader ....after bootloader is unlocked u hav to flash.kernel.of ur choice !
This can b done using flashtool...search the.forum.for bootloader unlocked nd flashing kernel ...links are already provided by another guy before me
Click thanks if u think i helped
SONY ERICSSON XPERIA X8
ACHOTJAN SEMC DEBRAND ENGINE V1.0 FINAL
bootloader unlocked ;)
nAa -11 kernel