Whoa he used the JTAG mode to unlock the phone. The JTAG is generally not accessible in normal functional mode of the chip. The only way is to get access to the JTAG mode using the TAP(Test access port of the chip). For that you need to know the registers in the chip which need to be written into.
Infineon will have loads of problems if they find the JTAG mode is vulnerable.
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