You really don't need to get rid of cwm to unlock your phone. Safestrap is working recovery for people with mf3 and newer firmwares. All that safe strap does in the unlock process is to enable flashing of a modem. The same can be done with cwm also.
but I tried almost everything to make it works, there's no way
I know I can flash the stock rom that will bring me back to stock recovery, but my internet connection is really bad, i need at least 2 weeks to download it
any help?