This is my first post here, I searched for answers on the forum but didn't find them.
I had a rooted I9300 that I upgraded with the stock 4.3 firmware a couple of weeks ago. As many people I am not satisfied w/ 4.3 mostly because of the battery drain pblm.
So I tried to downgrade to the stock 4.1.2 (found on sammobile, I cannot link it but this is the french ROM from my provider). I used Odin 3.09 and I must have done smthg wrong because I couldnt reboot properly (locked on the Samsung logo).I did a hard reset of my phone and I had it running on 4.1.2 as I wanted. But I had no more network access as somehow I corrupted my IMEI # in the process. I thought that I was screwed because of course no back up... But this morning I upgraded my phone back to 4.3 via Kies and I got my IMEI back
But still my problem is not solved as I don't want 4.3 on my phone!
So here are my questions:
1) I have read that it is not possible to downgrade because of the Knox flag. I don't think that I have this flag because I don't see it in download mode and moreover, I COULD downgrade to 4.1.2 (but without network access). Then, if I back up my /efs and redo the same process, will I get a phone running on 4.1.2 with network access?
2) I would like to understand why my downgrade didnt work (beyond the Knox problem, which I think is irrelevant in my case). I have two guesses: I put the .tar.md5 file in BL instead of PDA in Odin3.09, and my flash counter wasnt set to 0. Which one is the most likely to have failed my flash? Maybe both...^^
3) Last, In the case I can't get back to my lovely 4.1.2 can I consider to flash a custom ROM from 4.3, or this upgrade will prevent me to do anything?
I am sorry guys, I know that it is a long post but thanks for your answers!!!