yes use far manager whit CID49 support , that is you need to use newest sefp whit 2010db support, download this - http://tblatvia.bmx.lv/sony_ericsson...49_4_alpha.rar it includes all. then use z550 fake main (brake-in). upload it whit xs++, and then just run far, whit w300_w8... boot loader, that all :)

And ofcourse after far manager usage, reflash phone whit original main whit xs++.