I bought it from ebay PRL i wrote do nothing... From the begining i thought how is it possible OTA can be succeed without any change happen in carrier and pri file? I mean it just like we get in to Math class but we carry a biology book. OTA should do change in to carrier file and that's mean it's rewritable. But in the other post you said they're all signed so to edit it need to bypass the signature first. I'm little bit confuse about it because in iFile i found that for user can "READ and WRITE" (default) what is that mean? Back to my question again, lets say that my carrier do not offer an OTA things. What should i do?