Symbian phones have another security - AID. Setool, XS++, A2 Uploader, GFlash, EMMA, FAR). On A1 platform it is vital to flash your phone with the firmware with exactly the same CID as your Phone CID.ĬID can be checked with a tool supporting your phone (e.g. Second one is usually the same or higher than the OTP CID and can be changed using free/payed tools or also cannot be changed, depending on the phone's platform and model. First one is nearly impossible to change, you have to replace the chip to change it. There are two types of CID: OTP CID (One Time Programmable) and Phone CID. The higher the CID the more difficult it is to modify your phone with free tools. CID (Customer Identity) is a sort of security used in Sony Ericsson phones to protect them against unauthorized access.
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