Qualcomm EDL mode

[2][3] On Google's Pixel 3, the feature was accidentally shown to users after the phone was bricked.

[2] The Qualcomm Product Support Tool (QPST) is normally used internally by service center executives for low-level firmware flashing to revive Android devices from a hard-brick or to fix persistent software issues.

[6][non-primary source needed] Qualcomm implemented motherboards always include a test point.

EDL can be accessed by opening the back of the phone, finding the location of the test point, which depends on the model, and using a pair of metal tweezers to short the connectors and boot the phone into EDL.

The button can be represented as a switch, to be able to make the phone boot into EDL mode.