I have an AOSP rom of android 5.0. I unchecked the MTP checkbox in the settings, all options turned grey, a few seconds later the activity closed and now I cannot open it again to enable MTP. I've tried restarts and unplugging cable.
The setting under storage > [menu] -> USB computer connection does nothing when I click it.
How can I reenable MTP (or any usb transfer option really)?