Originally Posted by eddyo1993
thanks for the info. Now while looking on the site I ran across JTAG i think and i was wondering what it is. Also, could i install custom ROMS with custom recovery on galaxy S4 without sending it in and without using SafeStrap
JTAG stands for joint test action group, which is essentially a common IEEE serial port located on the motherboard of many devices. In a phones case, a Riff box is used to access the port and flash device specific files to the motherboard directly, thus eliminating the need for the phone to be on or functioning in the first place.
In this case, the jtag port is used to write to the emmc chip directly to override the system check and flash earlier firmware.
You can on the S4 but you need MDK firmware, you're better off asking in the S4 forum.
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