System apps reinstallation is very simple . But You must have root explorer or super manager or root manager to do this . but these three softwares are almost same . you must need to make a copy of the system apps and also the address file .odex when u re uninstalling the system apps . I used root explorer but the procedure should be same inthe super manager or root manager . first make a copy of the .apk and place it to system/app/ . then make a copy of the .odex file and place it same as above . Be aware when you are exploring the system/app keep the r/o as r/w placed at the top . after making copies long press over the app and the odex file and only change the permission as : User - read & write , groups - read , others - read . then change the r/w to r/o . reboot your phone . after that your system app should be in app drawer . use titanium to ensure that .