I was getting ready to do it to, you saved me xDIt is not, don't run sysupdater in the mode! That is still rxmode. Some builds of 2.6 do have Devmode at the bottom of the menu; you may have an older build of 2.6
I read a post on another forum I found from Google, people say that Rxmode in sysnand uses firm spoofing or something like that, so it will brick.
Do you know where I can find a build with Devmode, should I just use Rxtools 3.0? I got the 2.6 build straight off GITHUB.