Hi, a month ago I did something wrong with my Galaxy S3 SGH-I747M for not read here before do an upgrade that the new bootloader are locked and have a new counter called Knox but I upgrade to 4.3 from Rogers because I don't want to wait for the official 4.3 Claro Network, then I want to downgrade but Odin FAIL Oh noooo and trip the new counter to 1, when I knew what the problem was, I do a mixed Rom and works Very good on Claro Puerto Rico Network and I want to share my knowledge and what I do to this Model of S3 variation, I want to help and to be helped too. Just follow this simple instruction:
JUST FOR GALAXY SGH-I747M DEVICES
I donít know if works with other variant of S3 or Samsung Devices.
I want to Share the way to downgrade your S3 Canadian Version to previous version, I do it with 4.1.1 no network or Wi-Fi problems, and you donít need any patch for this.
1- From Sammobile
download your Rom 4.3 JB version.
2- From Sammobile
download your Rom 4.1.1 JB version.
3- Download Odin307
.zip and extract.
4- Only Windows users, download this program and install it Cygwin
5- To extract Tar file you need 7zip or Winrar, then extract from 4.3 JB the following file: NON-HLOS.bin. I know youíre asking why NON-HLOS.bin, because this is the modem and network file and the 4.3 bootloader installed in youíre phone donít work with the older, we need the newer from 4.3 for the phone works correctly.
6- Extract from 4.1.1 JB all the files except aboot.mbn and NON-HLOS.bin.
7- Go to C:/cygwin/home/'win_user_name' just cut & paste all the extracted file there without making any folder.
8- Open Cygwin Terminal cut & paste the following codes:
tar -H ustar -c boot.img cache.img.ext4 NON-HLOS.bin recovery.img rpm.mbn sbl2.mbn sbl3.mbn system.img.ext4 tz.mbn > S3ModedRom.tar
md5sum -t S3ModedRom.tar >> S3ModedRom.tar
mv S3ModedRom.tar S3ModedRom.tar.md5
9- Run Odin, go to PDA bottom and Find new Rom called S3ModedRom.tar.md5.
10-Restart youíre Phone and after it vibrate press Volume Down + Menu Button will show Download Mode press volume up and connect your device through usb cable to PC.
11- On Odin Hit start, when itís complete and say PASS
If this helps please hit Thanks