I have never had to restore my imei without a backup...so I strongly encourage you to do a full xda search of lost imei. I did and found this http://xdaforums.com/galaxy-s2/general/guide-recover-imei-9-steps-t1264021 I belive this might be all you need. I also Google searched how and I believe all Samsung devices use the nv_data.bin in case you were wondering if the thread on the SII was applicable.
I have never had to restore my imei without a backup...so I strongly encourage you to do a full xda search of lost imei. I did and found this http://xdaforums.com/galaxy-s2/general/guide-recover-imei-9-steps-t1264021 I belive this might be all you need. I also Google searched how and I believe all Samsung devices use the nv_data.bin in case you were wondering if the thread on the SII was applicable.