Configuration
The USB Host board will generate ASCII characters at the following baud rates2400
4800
9600 (default)
14400
19200
31250
38400
57600
115200
The default baud rate is 9600
This is what is written on the website I linked.
Anyways I solved it, just sending "BAUD 115200" command in loop function and not in Setup, since the board was receiving something like "AUD" or "BA" etc..
The solution was spamming to the board the command till the sintax transmitted to the board arrived correctly.