phones dead is repair boot i9192 help team

[sachu2002]

Open serial port...OK
Connecting to the RIFF Box...OK
Firmware Version: 1.38, JTAG Manager Version: 1.56
Selected Package: [I9192 MK4 Total Repair V1.00 by <legija>]

Connecting to the dead body...FAILED
ERROR: Failed setting JTAG speed. Terminating.

[Javohir]

Open serial port...OK
Connecting to the RIFF Box...OK
Firmware Version: 1.38, JTAG Manager Version: 1.56
Selected Package: [I9192 MK4 Total Repair V1.00 by <legija>]

Connecting to the dead body...FAILED
ERROR: Failed setting JTAG speed. Terminating.

use update firmware! 1.38 firmware not compatible in 1.56!

[vekt]

Open serial port...OK
Connecting to the RIFF Box...OK
Firmware Version: 1.38, JTAG Manager Version: 1.56
Selected Package: [I9192 MK4 Total Repair V1.00 by <legija>]

Connecting to the dead body...FAILED
ERROR: Failed setting JTAG speed. Terminating.

How to update the firmware, click "Firmware Update" in JTAG Manager v1.56

[jumper_cell]

How to update the firmware, click "Firmware Update" in JTAG Manager v1.56

Not solved...

[sachu2002]

use update firmware! 1.38 firmware not compatible in 1.56!

my firmware version is already 1.38
Firmware Version: 1.38, JTAG Manager Version: 1.56

[mtk6572s4clone]

my firmware version is already 1.38
Firmware Version: 1.38, JTAG Manager Version: 1.56

Use software 1.56 and click on "update firmware" for Really "to downgrade" to 1.37 Firmware...

And also look:
JTAG working after Firmware update to 1.39 - Unlock Forum - RIFF Box support forum

Greetings.