Stock ROM are the ones which come by default in Android phones or tablets. These are customized versions of Android done by mobile companies to make their devices unique in looks and features with official firmware.
Official Vivo Y31A PD1505 Stock Rom Firmware version: LA.BR.1.1.3.c14-04 System of Chips: Snapdragon 410 MSM8916 OS: Android 5.1.1 Lollipop KitKat Funtouch 2 Updates: 2018-12-29 Language: Multi File name: vivo_Y31A（C version）_PD1505_C_3.17.0_vivo_qcom_LA.BR.1.1.3.c14-04_split_5.1.1.zip Size: 1.6GB Download Firmware OR Mirror download Notes: Hos to flash Vivo Y31A Stock Firmware:…