Fastboot is a protocol used to flash partitions on Android devices while the device is in bootloader mode. However, Fastboot relies on the being functional. If you flash the wrong bootloader (aboot/sbl1), corrupt the GPT partition table, or a system update fails mid-way, your device will not enter fastboot. It becomes a hard brick —black screen, no vibration, no LED.
While is the standard interface for flashing partitions on an unlocked bootloader, EDL mode (often identified as Qualcomm HS-USB QDLoader 9008 in Windows Device Manager) bypasses typical bootloader restrictions. This makes it essential for: fastboot edl v2