Help me debrand my k750i

I have a K750i CID49, RED havin R1C021_china firmware and when i tried to change the the acoustics file, it didnt respond for the first time after a while it showed "Insert correct sim" whatever sim i inserted. when i connected it in SEtool2 lite it showed Network: Locked. Someone please help me release this lock.

Quote:

---

Originally Posted by sathish14_

I have a K750i CID49, RED havin R1C021_china firmware and when i tried to change the the acoustics file, it didnt respond for the first time after a while it showed "Insert correct sim" whatever sim i inserted. when i connected it in SEtool2 lite it showed Network: Locked. Someone please help me release this lock.

---

First of all you need MAIN,FS and Custpack for your phone,than you need XS++,
SimLock Patch Generator and SeTool2lite

then i have these i dont know how to do it, i tried with a tutorial form this site, but it says embedded bootloader failed to start??? what shall i do now

Like seamonkey said, reflash the phone. Then try to unlock it. If it doesn't works with SETool2 Lite, use jdflasher instead.