Here is the common nightmare scenario: You perform a factory reset on your JNY-L21 (either because you forgot your screen lock, the phone is lagging, or you bought a second-hand device), and suddenly the phone stops booting. It asks for the and the Huawei ID that was previously synced on the device. Without these credentials, your JNY-L21 is essentially a shiny, expensive paperweight.
Note: If the tool fails, you may need to enter "Upgrade Mode" (Hold Volume Up + Volume Down while plugging USB). jny-l21 huawei id remove unlock tool