So Today Iam Proudly Presenting This Patch To Fix It Up.After U Flash This Patch U Will See All These Things Is Fixed Which Are Written Above.
Then Go To Backup And Restore Option And Select TWRP Then Some Folders Ahead U Will See Two Selection 1 Is EFS
And 2 Is MODEM Make Sure U Are Selected Both Then Swipe And This Will Repair Your Null Imei And Unknown Baseband.After Youre Done Then Reboot Your Device And Then U Will See Your Sim Is Detected And Other Bugs Is Fixed Regarding This Issue.If U Are On new or older modem then all u need to follow installation instruction and then reboot your phone Now u will see that your baseband version is showing G7102DDUBNK1 if u wanto flash a new modem do search for new available modems for grand 2 Duos SM-G7102 And flash modem via odin and thats it.
A Bad Custom Rom Or Any Unsupported Rom Can Wipe Efs Folder,Efs Is The Most Important Part Of our Device's System.
And U Will Not Allowed To Create Any Thread With This Type Of Fix.