How to Change Baud Rate on ESP-01 WiFi Module with ESP8266 Chip?

Hello
Purchased ESP-01 modules do not respond to the command AT CIOBAUD? and
AT CIOBAUD=9600 or 115200, the terminal displays ERROR, and I need to change the
speed to accommodate communication over WIFI. NOTE - I also have
other modules of this type and I also can't use these commands to change speed, I use Terminal software - version 1.93b 20141030,
modules react properly to other commands. I didn't do anything with the software embedded in the modules, i.e. I didn't flash them. What am I doing wrong?
Please advise (I searched the internet but found nothing)

Greetings

To change the speed of the UART on the ESP8266, use the command AT+UART_DEF : Example: .
Link .