Seems b.box 13.8 connected to quattros and CCGX doesn't work. But I can't translate it's alarm.
4 times blinking BMU means battery failure. error and alarm leds blinking?
A red light must be reported to the place of purchase of the BYD. It is an internal fault, and should be fixed under their warranty.
To find out exactly what is wrong, an RS485 to USB converter (like Victron sells here) connection is required. When the battery in fault is connected directly with a computer, the BYD Battery & Query History Tool provides the diagnosis.
This is a technicians job, and that is a service tool. So if you are a customer, you are strongly advised to return the battery to where you bought it and let a technician service/replace it.