S7 edge how to check if your /system is protected?

I recently Rooted my phone and wanted to change my lock screen sounds. But I can't change my /system to R/W. Root Explorer no longer has the R/W button and SuperSU latest versions are system-less. I've tried terminal emulation and hours of googling to no avail. I had a reply saying that my /system could be protected. So how do I check if my /system is protected? If so how to i remove the protection.

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