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Your phone may permanently show the wrong IMEI, which is illegal in some regions and will get your device blacklisted.

The unique identity of your phone on cellular networks. Baseband Version: Critical for modem functionality. MAC Addresses: Unique identifiers for Wi-Fi and Bluetooth. Product Code: Regional information for software updates. efs.tar.md5 download

Tools like Z3X Box or Chimera are used by professionals to "repair" IMEI data, but these require specialized hardware and knowledge. Your phone may permanently show the wrong IMEI,