Hello, I recently started fixing Xbox's from RROD and flashing them (3 Xbox's) and I fixed a Xbox 360 Falcon 2007 model which was one of them. It had the E74 error and Once I cleaned the chips, GPU, CPU, RAM chips and the rest of the motherboard I added new thermal heat compound paste to the GPU and CPU chips. Once I had a small layer on all 3 of those chips I over heated the console to update the GPU and let it cool down. Once it had cooled down I turned it on and it worked perfectly but it still had the 2008 dashboard. As I went to connect my wireless adapter it asked for a system update so I updated it and after 2-3 minutes it failed and stopped so I turned off the Xbox and turned it back on, now it's powered but not boot up or anything. What's the issue here and how ca I fix it? Many Thanks.