Hate to de-necro this thread but I created an account just to say, "Thank you. Thank you. Thank you. Thank you. Thank you. Thank you. Thank you." FINALLY got my friggin' phone rooted.
I'm curious how you approached your phone modding. Traditionally it seems to use ODIN to install a recovery, such as TWRP. Then using TWRP to flash a custom ROM.
Maybe there are others who still tinker around with this old (circa 2012) Samsung Galaxy S3 i747 While I am a newbie, I have enjoyed flashing Custom ROM's , from CyanogenMod, thru various versions of Lineage, and now CRdroid.
Totally free of Google; no Google Play Store, no Google Pay, no Google Framework, no Gapps, no Google spyware, no Google bloatware, no Google tracking etc.
I download all my apps as APK's which are readily available on the Net ( Google them . . . just kidding! ).
My older Samsung S3 i747 was a 'd2att' originally locked to Rogers, in Ottawa, Ontario, Canada. Then switched over to MTS (Manitoba Telephone System). Now running on Bell Canada. My replacement is also a Samsung S3 i747, originally running T-Mobile in Arizona, now running on Bell Canada.
Damn fine phones.