Verizon Galaxy S4 Stock Firmware SCH-i These are stock firmwares for Verizon Galaxy S4 with model number of SCH-i only. Any update above Android + will lock your bootloaders so do not update unless you are already on Android or higher, otherwise you will lose your ability to have unlocked bootloader! Jun 04, · xda-developers AT&T, Canadian Bell, Rogers, Telus, Virgin Samsung Galaxy S 4 AT&T Samsung Galaxy S 4 General [16 May] Official STOCK firmware collection for Galaxy S4 (AT&T/SGH-I) by AdamLange XDA Developers was founded by developers, for developers. Samsung Galaxy S4 SGH-I Stock Firmware. On this page you will find Samsung Stock Rom for your Samsung Galaxy S4 SGH-I device. Click Download button to download the Samsung Galaxy S4 SGH-I Stock Firmware on your computer.