[i have cx65 v12 and cant unlock with dima debil and x65 unlock by legija......]
I have 100% working solution for that phone.
First of all I have uploaded .rar file, in which you have all the stuff I'm going to mention in this tutorial. Unrar it to c:\ or d:\ ,do not use long name directories.
1.You have to patch the bootcore with chaos patcher
1.1 Power on phone with sim card that is accepted by phone and upload patch to the phone using Siemens Data Excange software or similiar. If you don't have that kind of SIM card use program Simsim to emulate SIM.
1.2 Start the patch, it will be in dir here you put it, and after some time your phone should go off. Wait for that to happen, leave it few seconds more to be sure.
1.3 Power on the phone again and start the patch again, now it tells you that patch is already installed (bootcore patched).
2.Then you have to write small part of flash (with some changes) to your phone with x65 flasher
2.1 Connect phone with cable and press "Connect" button
2.2 In the field Address write A0c60000 ,and in field Lenght write 00020000
2.3 Pres "Write flash" button and choose cx65v12_A0c60000_unl.bin which came in the .rar file
3.Use GetCode.exe to get FSN ID code, read IMEI of your phone (*#06#), and write all to the paper (try many times if you don't get code at first time, and your phone should be on when you use Getcode)
4.Start MAP Maker by CyberGSM.exe and write your IMEI and FSN ID and press "make map" button
5.Now you have Siemens A50 - 3xxxxxxxxxxxxxx unlock.MAP and 3xxxxxxxxxxxxxx.log.
This log file is used for Siemens EEPROM tool 3.15 to unlock your phone.
6.This final step is most IMPORTANT BECAUSE YOU CAN KILL YOUR PHONE if you do it wrong. But if you carefull you don't have to worry - I unlocked many CX65 phones, including the version you own without any problem.
Proceedure
6.0 Your phone should be Off. Save your EEPROM [in the rar file are both pictures with proper proceedure for saving EEPROM and for uploading map file so don't be afraid to use them

]
6.1 Press "Init" button and wait until program recognize your phone (it will write some informatios in Mobile information field)
6.2 Press "Load" button and open your Siemens A50 - 3xxxxxxxxxxxxx unlock.MAP
6.3 Press "Select All" button and move all to the right field (to Phone's EEPROM blocks)
6.4 Press "Select All" button (on the right side, not the one you previously pushed ;-))
6.5 PRESS "SAVE SELECTED" (Don't even think to press "Save all" becouse you will kill your phone)
7.Put any SIM card inside telephone and push On button, wait few seconds, call anyone you want becouse you are proud owner of 100% unlocked phone

!!!