How the JCID tag-on process works for the iPhone 14 Pro

1. Read the original data: A technician uses a JCID programmer tool to read and back up the unique encrypted data from the iPhone’s original dot projector (part of the Face ID system).
2. Attach the tag-on flex: A new JCID “tag-on” FPC flex cable is attached to the original dot projector. This is a non-soldering method, which simplifies the repair.
3. Write the data: The original Face ID data is written from the programmer onto the new tag-on flex cable.
4. Activate the module: The technician uses the programmer to activate the original Face ID module with the data now on the new flex cable.
5. Install the component: The assembly is installed back into the iPhone, and the phone is reassembled.
6. Verify the repair: The Face ID function is tested to ensure it is working correctly and that no warning messages appear. 

Important considerations

• Requires specialized tools: The JCID tag-on solution requires a JCID programmer (like the V1SE or V1S Pro) and the specific tag-on FPC cables for the iPhone 14 Pro. This is not a repair that can be done at home without significant technical knowledge.
• Professional installation recommended: Due to the delicate nature of iPhone internals, this procedure should only be performed by a professional and experienced technician.
• May not be a complete fix: In cases of more severe damage, such as a damaged flood illuminator or infrared camera, this method may not be sufficient.
• Not an official Apple repair: Using third-party tools to repair a component like Face ID is not an Apple-sanctioned repair method. Apple strongly recommends seeking service from a trained technician using genuine Apple components for laser systems to prevent hazardous exposure.