1.Download the latest rom from this site- http://achonapp.com/?path=/samsung/GALAXY S3/ckh469/CM12
2.Download gapps for android 5.0 lollipop
3.Download the kernal for your device. personally am using arter97 kernel 4.0
4.Download the USSD fix from here-http://www.mediafire.com/download/mq...r/USSD-Fix.zip
5.Put those 4 files into ya device storage and reboot your device into recovery
5.wipe data>Clean to install new rom
6.install ROM then GAPPS then the KERNAL (dont flash the USSD fix yet)
7.wipe cache and dalvik cache
8.reboot your device
9.after booting up then boot into the recovery again and flash the USSD fix
Thank you, but the USSD fix link seems broken