Also, check out this thread it might be related (again if you can run AT+ commands)
*If you’re running a windows machine check ports via USB connection and then putty serial to that com port and you should be able to run AT+ commands again other wise netcat (nc) commands on Mac or Linux
The serial connection is not forgiving, and if you make a typo just CTRL+C or hit enter and start over, also if you use copy and paste a lot of times the double quote is wrong and curly if you will… So best to type out the commands.