In case if you have flashed latest SuperMan-Rom V1.5.1 using TWRP 2.0.3-0, Then you may lost IMEI, baseband etc, You can’t even able to make or receive any calls. Baseband version is ‘Unknown’ and IMEI & IMEISV (slot 1 & slot2 ) are ‘Unknown’ too.
What is the reason of IMEI & baseband 'Unknown'
Its many times happened with me when i wiped my basband. in case you install incorrect CSC files. Same thing happened to me with the Superman Rom. I always suggest you to make EFS backup.
It can be solved with easy steps first of all you need to download Samsung Odin for your Samsung mobile phone and you must download all latest version of Samsung Odin. After that you have to download a correct the stock Samsung firmware. before download stock firmware you need to check the PDF version of that file.
Can we fix IMEI & baseband 'Unknown' without any BOX?
Yes it is possible to restore your baseband and IMEI number without using any box like Z3X. You can follow the following steps to restore your baseband and I ME I number.
Before flashing your smartphone you need to download Samsung from there for your origin country just support your origin country is India than you have to download Indian from here only, because many countries locked dear network for a particular country.'
While flashing your Samsung phone with Samsung Odin you need to make your PHONE EFS clear and phone bootloader update or checked then connect your Samsung device ( download mode ) with Samsung Odin and click on flash button it will flash your device. (In case your device did not appear in Samsung Odin3 then install Samsung USB driver).
In case the Odin failed to flash Samsung Device or show you error like Please get the approval to use factory binary (Pit) .You can also fix it. you need to select extra setting on Odin and then tick on Nand flash. It will fix the error temporarily.
If you have installed TWRP, go to my manager and delete everything inside the EFS folder and now you don't need the original stock ROM just download APDN or APDU but it will required binary file.
You have to remember that do not use the wrong Samsung ROM in case you have use the wrong country origin from here then you may lost your network permanently. I always suggest to make a FFS backup before placing any ROM into your Samsung device. You need to make EFS backup before rooting your device.