Actualizar o reparar el EROM-FOTA en teléfonos CID 49 o CID 51 con XS++

[3dfx]

hola!
quiero actualizar mi E3ROM RA016 A UNA R3B019 pero a la hora de ponersela me aparece este log:

que debo hacer y porque me aparece este error



20:58:29| XS++ v1.2 Ready !
20:58:35| Shutting down...
20:59:58| XS++ v1.2 Ready !
21:02:46| Attempting to open the interface...
21:02:46| ++++++++++++++++++++++++++++++++++
21:02:46| Turn off phone
21:02:46| Hold C Button on phone and connect phone.
21:02:46| You have 30 seconds.
21:02:46| ++++++++++++++++++++++++++++++++++
21:02:46| PORT STATUS: ACTIVE
21:02:47| Baseband ID: 9900
21:02:47| Hardware Platform: db2020
21:02:47| Protocol Version: 3.1
21:02:47| phone name detected
21:02:47| ++++++++++++++++++++++++++++++++++
21:02:47| PHONE INFO
21:02:47| ++++++++++++++++++++++++++++++++++
21:02:47| DBID: db2020
21:02:47| OTP CID: 51
21:02:47| EROM CID: 51
21:02:47| EROM color: Red
21:02:47| IMEI: 35220801xxxxxx
21:02:47| Phone: K790
21:02:47| Operator: AMERICA_2
21:02:47| CDA: CDA102535/309 R8A
21:02:47| Firmware: R1EG001
21:02:47| EROM: R3A016
21:02:47| ++++++++++++++++++++++++++++++++++
21:02:47| Ready for operation!
21:05:23| Sending loaders\db2020_cid01_cert_p3g.bin...
21:05:23| EaTEbS: Failed
21:05:23| Sending loaders\db2020_cid51red_flash_r2a005.bin...
21:05:23| Failed
21:05:23| Error: Cannot send flash loader
21:05:23| ++ Error: Flashing failed
21:05:25| Disconnected... Unplug the phone
21:05:42| Attempting to open the interface...