I wanted to sale my tecno n9(tab) so I factory reset it to wipe my personal documents and related files. After the process, my tab started to pop out a massage " unfortunately SalesTrackerSystem has stopped". The worse is that if I click OK the massage will be keep popping out rapidly without giving me chance to access the tab. If I have to flash new stock rom, pls grant me permission. My email Kingeric584@gmail.com