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Null imei baseband = unknown

I have a GT-I9505 and tried out the miui 4.4 patchrom flashed via twrp. The imei number went missing and i used odin to restore stock lollipop. Now it lists baseband unknown and IMEI null. Any fixes? I have the s/n and imei on the back of the phone

It sounds as though you have a lost or corrupt, "/efs file".

If you followed best practice when rooting or flashing ROMs and made nandroid backups prior to flashing, then you can restore that and it will replace/restore your, "/efs", file. See, #3.2 & #3.3 of [International] Rooting Galaxy S4 - Dummies Guide

Alternatively, if you use a custom recovery and made a backup in the past, most will save a copy of this all important, "/efs", file to storage on your phone somewhere.

How to Backup and Restore EFS / IMEI on Samsung Galaxy Devices – Did You Do It?

If you do not have a backup you can try the method described here.. [GUIDE] Recover your IMEI in 9 steps.
 
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It sounds as though you have a lost or corrupt, "/efs file".

If you followed best practice when rooting or flashing ROMs and made nandroid backups prior to flashing, then you can restore that and it will replace/restore your, "/efs", file. See, #3.2 & #3.3 of [International] Rooting Galaxy S4 - Dummies Guide

Alternatively, if you use a custom recovery and made a backup in the past, most will save a copy of this all important, "/efs", file to storage on your phone somewhere.

How to Backup and Restore EFS / IMEI on Samsung Galaxy Devices – Did You Do It?

If you do not have a backup you can try the method described here.. [GUIDE] Recover your IMEI in 9 steps.
Unfortunately i have no efs backup, will try that method and let u know how it goes
 
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