Cannot get serial info: Innapropriate ioctl for device

Question

Code:

 #!/usr/bin/env bash
    
BASEBPS=24000000
    
[ "$2" = "" ]  &&  { echo 'use args <dev> <bps>'; exit; }
dev=$1
bps=$2
    
setserial  $dev  divisor  $[ $BASEBPS / $bps ]  spd_cust
stty -F $dev 38400  2> /dev/null

Execution:

~$ sudo ./setbaud.sh /dev/ttyUSB0 256000
 Cannot get serial info: Innapropriate ioctl for device 

Someone know if there is a way to solve this?