Just installed 3.1 on my S3 but it doesnt detect my SIM, any help please?

I think I did backup my EFS only and got a .img file. So I have to at least restore it first? Sorry I am new to this.

EDIT: I restored my EFS but still in my About->IMEI Information it displays 2 unknowns.. any way to fix this/?

EDIT2: Say I didn't backup my EFS..what should I do to proceed...

This post has been edited by Steven7: Jul 30 2015, 06:09 PM

Any shop or samsung service centre? How much do they charge usually?

Thanks to @surefire v LED. I've managed to restore my EFS. But I have another problem. I have reverted everything to stock ROM and everything works, IMEI is correct and SIM is working. So I again flashed to AD3.1, then the SIM is not detected. But the IMEI stays and is still correct though. Any help please?

I have tried reboot and reflashing..seems like custom ROMs simply wont detect my SIM. The only ROM that detects my SIM is the latest stock ROM. So every time I will start flashing custom ROM from that point, and once I boot into custom ROM its either SIM wont get detected or IMEI gets unknown.

I tried this, at working custom ROM I use TWRP backup /EFS. Flashed custom ROM. IMEI unknown. Restore the /EFS backup made earlier. But still to no success.

But even when I am on stock ROM I am using TWRP 2.8.6 and the SIM works. Is there any other reason why the SIM only works on stock ROM?

This is the stock ROM I9300XXUGML3_I9300OLBGML3_I9300DXUGMK1_HOME.tar.md5 that works. So in the end how do you fix the issue? what is the root cause of your problem exactly?

In fact when I flashed AD3.1 to my i9300 my IMEI and baseband are correct but somehow I got the No service error.

Ok I'll try it..which recovery are you using BTW. I was using https://dl.twrp.me/i9300/twrp-2.8.6.1-i9300.tar.html earlier.

Ok you won't believe this. Originally I have given up but I saw your reply so I turned on my i9300 to try your fix, but without even trying your fix, it works...SIM is detected. I have tried reboot, power off for few hours the other day but not a damn thing works. Now it works without any fix...so thanks guys.

BTW, although it works now (and I have made a full nandroid backup) but when I flashed the ROM last time, I untick Xposed just to save that lil bit amount of time. Now I wanna install Xposed manually as I was too afraid to reflash it again. I just wanna ask the Xposed originally included in AD3.1, is it the same with the one here http://forum.xda-developers.com/xposed/sup...xposed-t3072979 ? I wanna try to follow the instructions there.

Hey guys, just realized a problem on my i9300 AD3.1 where my GPS is not functional at all. Did some search and some guy say it may be a Baseband version issue where I am using i9300DXUGMK1. Did you guys face any GPS issue with this baseband or how to I update to new baseband?

Thanks but my GPS was working in Stock Samsung ROM, it only stops working when I flashed AD3.1 into it and I may have flashed some old modem firmware into it, causing the GPS not working. Does anyone have any more ideas?

But I am doing fine with AD3.1 and I loved it, don't want back to be using stock ROM. By the way, I should be more clear when I said GPS isn't working, I downloaded GPS Status and it shows that my GPS signal keeps dropping, thereby making it unusable.

EDIT: Solved by tightening the screws. Its locking faster than ever now.

This post has been edited by Steven7: Aug 19 2015, 09:28 PM

Sorry I don't have any idea on that issue. BTW on AD3.1 did realize incoming call wakes up my screen too slowly, is that the issue you're facing as well?

BTW, yeah I tightened the screws on the back of my phone and voila.

Just saw an update to AD3.1.2. Just out of curiosity, how to I update to that version. Fetching, downloading and reflash it?