[Q] Root IMO S50 topic

I have IMO S50 and I was trying to install CWM via MTK SPFlashTool readback method
I followed all the step but it always ended up like this

http ://puu.sh /dJXPP /59274df14c. png (yea I can't post image)

I already tried a lot of root method from framaroot, root towel, iroot, root genius etc but none of them work

my phone is MTK6572 with KitKat 4.4.2

I wonder why all those method didn't work, could anyone help me?

thank you.