You must obtain your console's unique and a dump of its current NAND flash memory . Xbox 360 Dashboard / System Update 2.0.17559.0 ... - Digiex
The core engine used to build the hacked NAND image. Version 1.21 or the latest XeBuild GUI 2.098 are required to support the 17559 kernel. xebuild 17559
Updating involves three main phases: dumping your current data, building the new firmware, and flashing the console. 1. Dumping the NAND You must obtain your console's unique and a
A homebrew application that allows you to dump your current NAND and flash the new updflash.bin directly from the console. Version 1
Often cited by the community as a more modern and reliable alternative to the original XeBuild GUI for RGH3 and newer mods.
Updating a modded console is not as simple as clicking "Update" in the official menu; doing so on an RGH/JTAG system without the proper preparation will brick the console. You must use specialized tools to create a custom NAND image.