Top 5 samsung galaxy s3 custom roms install a custom rom on your galaxy s3 and you could get a faster, fancier phone with longer battery life. here are the five best roms.. Here are the steps to update galaxy s3 i9300 to android 5.1.1 based custom rom: connect your samsung galaxy s3 i9300 to your computer using usb cable and copy the downloaded files to the sd card. Since, samsung is not providing updates to galaxy s3 users, the only chance that remains is using a custom rom. in most of the aspects, they offer better features, and performance. in most of the aspects, they offer better features, and performance..
Download samsung galaxy s3 gt-i9300 firmware from here, flash it in your device and enjoy the native android experience again. the download file contains the usb driver, flash tool and the firmware file.. How to flash omega aokp kitkat custom rom for galaxy s3 i9300: download the custom rom zip from here. how to install android 6.0.1 custom rom for samsung galaxy s3 lte i9305.. Download the latest samsung stock rom (original firmware) for all samsung smartphone and tablets with instruction manual. firmware; drivers; tools ☰ download samsung stock rom for all models. home > firmware > download samsung stock rom for all models. twitter. facebook. updated on february 8, 2019 samsung galaxy s3 gt-i9300 stock.