I will try to tell you a step by step guide, but this process needs some skills , so if you think you are not skilled enough, better take your phone to a professional unlocker. You were warned!
1 use service cable for siemens X55 series
2 disassemble phone , take off the shield from the pcb above the flash IC (look at attached TP picture)
3 take a surgical needle (U can get it from any p_ha_r_macy) and carefully scratch the bus shown with RED on the attached TP picture
DO NOT drill a hole, becouse you will hurt 2nd layer, only scratch!
4 connect phone to service cable with powered OFF
5 start joker , set com port, boot type to bootcore bug and at skey tab push recalc all keys button
6 push power on on phone. If TP is scratched right, process will go on and after a few seconds will stop with success and your phone is unlocked
if at power on process starts, but stops immediately with boot error message, that means you must scratch TP bus again, becouse it's not cutted right
good luck