With the new dashboard update 14717 or14719, the way used to disable the RGH chip does not work any more. After the update you have to physically disconnect the +3.3V from the the RGH chip to be able to boot oringinal nand. Adding a switch is a simple way but a little messy as you would have to drill a hole on the Xbox360. Some people used a 3.3V relay instead of a switch. But 3.3V relay is not easy to find.

Here we have an electronic solution for the swtich without using a relay or physicall switch. It consists of 2 transistors and 1 resistor as show in picture below:



When the level of pin 2 on Cygnos switch that used to disable RGH chip is Low, its to boot stock nand and High to boot RGH nand. So, when the pin is on High, it turns on Q1 making the base of Q2 low , which in turn switch on Q2. The RGH chip then gets +3.3V power via Q2 that connected to +3.3V rail. The 10K resistor is used to limit the current when Cygnos swith pin2 is on High. it works perfect when tested on a slim Xbox360.

Daul nand with Cygnos360 V2  E on a Slim Xbox360

Cygnos360 V2 E is so far the best device to install dual nand boot for Xbox360 especially for the Slim version. It does not require to cut the tiny CE trace on the motherboard in order to switch between stock nand and hacked nand.

When switching to stock nand, the Glitch chip needs to be disabled. A lot of installs used a replay or toggle switch to interrupt the ground wire. But this can be done by modifying the cpld code without using the a replay or any methods to interrupt the ground wire.

Installation can be viewed at www.consoletronics.com/images/dual_nand.jpg