Download Android Jelly Bean 4.2.2 stock firmware for Oppo R830 smartphone from here or here. Download previous firmware from here. Download another Oppo firmware from here.
Archive: OPPO R830 11_A.01_140125 MT6572Image: R830_11_A.01_140125_SVN5207 Model: Oppo R830 smartphoneImage file size: 733 MB
Platform: Mediatek MT6572
Project: OPPO72_13083
Config_version: V1.1.1