About modem the dr has answered.I want to ask last thing, how can we flash modem only via odin? I had to flash custom recovery in order to flash modem, and I want to remain on stock recovery due to the warranty, and last question is even if kies dont detect the device due to csc mismatch, will firmware upgrade option in tools will work?
About the second question. The answer is there in my step-by-step story. Kies doesn't have to detect your phone (i had csc problem too as described). You are going to connect it in download mode so csc wont matter. Just do exactly what I wrote down and stop confusing yourself before you even start
Also dont use KIES Emergency Firmware Recovery unlike someone else advised above (that will not work for you). But rather use KIES Firmware Upgrade and Initialization. The two is not the same thing.
If you go into Kies Firmware Upgrade and Initialization, just follow the simple steps that are presented to you by the software itself.
0. Make sure you have a working modem (dont worry about version mismatch csc). So basically your stock firmware from sammobil and an upgraded modem (dmg1 with efs recovered from backup) so that imei is recognized.
1. Input phone model
2. Input Serial number (as said, you an find that under the battery, on the phone)
3. Turn off phone and put it in download mode.
4. Follow instruction on when to connect phone (Kies will download the right firmware and flash it for you, but this time the old modem will be fine)
... This is what did the trick for me... As I said you have nothing to loose, it cant brick your phone or anything like that.
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