HC-12 AT command issue

I’m having trouble with my HC12 radio transciever. No matter what instructon i send when the device is on command mode. It will always return “OK”.

EX: I send AT+CH021 to change to channel 21 and it says OK too when It should respond OK+021. It seems like it just doesn’t have any commands at all. I tried every command in the datasheet but it always responds with OK.

It works fine with the default params, but i need it to be able to switch channels to communicate with multiple devices once a while. Any ideas?

This is the one I bought

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