hello everyone..sorry ask noob question and my bad english. i want ask something about MIUI 2. 8.3/2.8.10..i try flash this rom..and success everything works.. but when i plug my USB.. why just USB debugging detect..my sdcard can't mount just MTP not MSC ?? this bug ? or my phone not support..because my Arc S Locked bootloaders i try at setting > storage > mount Sdcard not effect. then i try edit my build.prop add persist.sys.usb.config=mass_storage not effect too anyone can tell me about my problem..