When security researchers find a flaw in Qualcomm’s TrustZone or Boot ROM, that flaw becomes the "unlock tool." Recent examples:
Qualcomm chips have a low-level rescue mechanism. By bridging specific test points on the motherboard or using a specialized cable (EDL Cable), the device identifies itself to a computer as "Qualcomm HS-USB QDLoader 9008." qualcomm bootloader unlock tool
An EDL cable is a modified USB cable with a button that shorts the D+ and D- lines during boot. This forces any Qualcomm device into (even if USB debugging is off, even if the screen is black). When security researchers find a flaw in Qualcomm’s