through hardware test points to communicate directly with the device's chipset. ADB Integration : Some versions of this process involve an ADB (Android Debug Bridge) fix to enable the bypass. General Procedure for Use

Specifically regarding "Hot" indicates a method that does not require disassembling the phone (cutting the heat shield to access test points for EDL mode). Instead, it uses a combination of software and a USB cable to force the phone into a state vulnerable to QSF writing.