Hi, I am from the Philippines and I am a noob. My S3 GT-I9300 is a locked JB 4.1.2, and I need to unlock it because I want to install custom roms in it. Unfortunately I can't find anyway to unlock it. I read from somewhere that I should first downgrade to 4.1.1. Unfortunately still, I can't find anything that can help me downgrade to 4.1.1. I tried looking for downgrade tools and stock 4.1.1 firmwares to use with odin, but i've found nothing.
Please don't direct me to threads that makes me enter a code then main menu, umts, debug screen, etc. I tried it about 92.4 times. Doesn't work because it only works on 4.1.1, which is why I'm wanting to downgrade.
Help me, please? Thanks in advance.