[Q] How on UMS for i8190n? topic

Hi

I read many article about UMS, but no one work for me.
I would like run UMS on i8190n with FW 4.1.2

option 1
setprop persist.sys.usb.config mass_storage,adb
option 2
SGS3 + BusyBox
option3 (hide for me)
MTP mode can be enabled/disabled in Settings > Storage > (overflow menu or 3 dots right top of the screen) > USB computer connection> tick the MTP

Thank you