problems with blackshark v2 x

My native language is not English, I use a translator, sorry in advance.I wanted to enable 7.1 sound, but this requires a serial number and this caused 3 problems1) I found the serial number, but it is partially erased, some numbers are not visible, but the barcode is fine.2) when I launched the official Razer program for 7.1, the computer stopped recognizing the microphone3) how to put the ear pad of the left earphone back))