Normally Id just delete a post if it prompted me to give the advice Im about to give, but this time Im going to allow it in the hope that others may see my response and be educated.
There is some crucial information missing from your post that will prevent anyone from helping you.
How did you try and put your card into monitor mode? What guides did you follow, and how did you try and resolve any problems that occurred? Did you get any error messages?
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