Root [AT&T] AT&T Firmware

[fedetics]

Currently have a Galaxy S3 with firmware from Movistar. I want to change it to the AT&T firmware.
What is the process? Thanks

 

[Rukbat]

Find a flashable file of the AT&T firmware (which may be possible, but I wouldn't bet on it). Follow the instructions for flashing. Or you could have Samsung reflash the phone (for money).

 

[fedetics]

Thanks. I have the AT&T firmware file.
What software can I use to upload firmware to phone?
What is the process?

thanks

 

[Mikessv]

Thanks. I have the AT&T firmware file.
What software can I use to upload firmware to phone?
What is the process?

thanks

You can use Odin to flash the firmware

 

[Madroxide]

Thanks. I have the AT&T firmware file.
What software can I use to upload firmware to phone?
What is the process?

thanks

Do you still have the firmware? I've tried finding it but the only place it seems to be is SamMobile and they are having file server errors.