Originally Posted by pisek3
Hello gentlemen, I have Galaxy S3 and I have there stock rom from samsung android version 4.3 (specifically i9300XXUGNA8) and I would like to try a MIUI rom. However I find guide only with downgrade on stock rom version I9300XXDLJ4 which is android 4.1.1. But I know that it used old EFS file version 1 and in my rom is EFS v2. So if I downgrade it, the telephone was not work - especially signal from operator. Does anyone have any advice or some guidance on how the stock Samsung rom to MIUI. Thanks for the advice. (and sorry for my english)
I've used the MIUI rom for s3, and trust me, it's really good. The only downside is that you have to downgrade to android version 4.2.2 which is CM based. The latest version is based on 4.2.2, not 4.1.1
You have to do this:
1) Root your s3 following a proper guide. There are plenty on the net. Just google it.
2) Install a custom recovery. I recommend TWRP or Philz Touch recovery.
3) Download the MIUI rom from their official website en.miui.com
4) Flash the rom using the recovery.
Done. Hope this helped