He was in. The gatekeeper—the terrifying S1Boot driver—had let him pass.
If you see a device serial number (e.g., BH901XXXXXX fastboot ), the driver is working correctly. s1boot fastboot driver
If you see "S1Boot Fastboot" with a warning sign in Device Manager, use the Update Driver > Let me pick method to manually select the Android Bootloader Interface . He was in