Which Rom is on your phone? On there website is a notice that will not work on every custom Rom, also in the tool. I did that with magioRom, because I was on hboot 2.16. Try it with CyanogenMod if your hboot is lower.
I am on cyanogenmod..
I tested a lot of things and this is the fastest rom for our phone ,it is great.
Sent from my Wildfire S A510e using xda app-developers app
I am using MIUI V4 and it is great.
Sent from my HTC Wildfire S A510e using xda premium