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Do you terminate the commands you send with /r/n ? (Append CR-LF ?)
Is autobauding enabled? Then you will have to send "AT" to the module first, in order to sync the baudrate of the module with your computer. After that you can set a fixed baudrate with AT+IPR=<baud>
The only thing I can think of is that autobaud is enabled, you need to first send "AT" to the module, note the upper-case, in order to have the module accept your baudrate.
After that you can configure a fixed baudrate with AT+IPR=<baud>
Also check that you terminate your commands with /r/n, or...
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