since i have done many convertion of samsung a127 to m300 to work with 900mhz frequency now its time to share this convertion method originally made by me.
this is the final solution
1. first backup the phone original flash file just in case
2. flash the phone using ustpro into m300
3. after you success in flashing imei will be damage it become 00000000000000
4. you need to rebuild the imei using ustpro or any other samsung tool. maybe you know how to do it
5. do the hardware modification show in picture.
6. cut the green line show in picture then jumper the red line
P/s : Anh em có máy test nha thanks all