The iQOO Z6 Pro does support EDL point free entry via the Volume Up + Down key combo when the phone is in a crash dump state. You do not need to buy a $40 cable.
Some technicians use specific tools to force the device from Fastboot Mode directly into EDL mode without opening the back panel. No-PC Methods:
Locate the two small copper dots (test points) near the battery connector or under the thermal shield.
