if the 360 is made before july 2009 and has a dashboard version between 1888 - 7371 you install jtag (kingkong exploit \\ 10EC exploit [different name same exploit and the only "PSEUDO-SOFTMOD"]) based on your motherboard revision and remove rt63, if dashboard is above 7371 rgh1(hardmod cpld), if its a slim console or above 14699 use rghv2 (hardmod cpld different wiring), i recommend to stay away from 360 E (superslim) as they are the only crapshoot, if you have an E model with a Winchester motherboard...rgh is patched on that specific mobo (iirc released around 2015ish and is the very last revision motherboard). you cannot downgrade any dash once it updated, downgrading would require rgh or a jtagged console which defeats the point of downgrading since the console would already be exploited in order to be able to run it, though i did always wonder if one could exploit the efuses, if you are able to write/burn code/data into the efuse set, and if you would be able to load/execute from that data (since the efuses are inside the cpu its considered trusted..?) only catch is that you have less than 64bytes or so, and once written it's undoable.....so make a backup and spoof it when needed