I'm trying to do something similar... I had a 29 wire mod and upgraded to an 11 wire xecuter 1 a while back...
here's the gist:
connect the jumpers that allow the tsop to be writable (there is one on the top and one on the bottom)
load up evox and have it ready to flash the bios of your choice...
boot up with your modchip on and then once in evox switch it off and flash... done
the tricky part is figuring out where to put your switch on a 29 wire mod... (the 11 wire is easy just disconnect the d0 point)
this is the THEORY... I havne't actually got it to work yet I keep getting a "Not Writable" error which suposidly means I dont have the jumpers connected good enough