so what your saying is if i install the update no efuses are blown
If you're on 13604 dash then M$ 13604 Update will be ok !
Means ,you have to have a hacked kernel first then you need to update with same update as your xbox's kernel have ..
System settings > System Info >(Always) 1st check the kernel version then update with same version M$ update that your kernel have !
If you have 14699 then update with M$ 14699 Update
or if you have 13604 then update with M$ 13604 Update !
If you're on 13604 kernel and you want to go 14719 kernel then you need to build a14719 hacked image(
Using This tutorial !) first then update with M$ 14719 Update !
Hope you will understand