When I attempt saving my preference themes in dashboard. There was an error message showing "You do not have sufficient permissions to access this page". So the first thing come up to my mind is might be the file permission etc. So I did change it in inside server /plugin /Any-mobile-theme-switcher using Filezila. I right click and change the permission into 777, and did also tried the 664 but still no luck.
I'm still a newbie of WP, so I'm not good on this issues. Anyone can help me solving this issue?