Full logs of the operation/
Quote:

Quote:

To enable 'Upgrade' mode
1. Power off the phone. Remove SD and SIM cards
2. Press and hold 'Vol-' and 'Vol+' keys and insert USB cable
3. Wait until phone enters 'Upgrade mode'

2019-04-14 16:24:15 GMT -------------------------------------------------
Starting Reset FRP (Fastboot Mode)
Searching connected Fastboot devices...

Device Model: ‪NEM-L21‬
System: ‪NEM-L21C432B361