A20s Firehose Loader

: Before performing operations that may affect data integrity, users should back up critical data.

Since the screen may be black, you cannot use ADB. Instead: A20s Firehose Loader

Never pay for a "remote unbricking service" that claims to have a secret Firehose loader. The A20s loader is freely available in combination firmware files. : Before performing operations that may affect data

Keep your A20s Firehose loader on a dedicated USB drive alongside the stock firmware. When your screen is black and Odin is useless, this loader will transform your bricked phone back into a working device. Remember: always back up your QCN (radio config) before deep-flashing, and never share your IMEI data online. A20s Firehose Loader