I think some other files are important other than nav data like for product code and others. So i thought efs.img is best option as it backup everything on partition as it is.
Some issue like missing product code, losing imei after restart are some issues may associated with other files. So better to make full partition backup.
Sent from my GT-N7100 using xda premium
Some issue like missing product code, losing imei after restart are some issues may associated with other files. So better to make full partition backup.
Sent from my GT-N7100 using xda premium