Null IMEI when updating to Lollipop

Hello mates, I previously had my brother's ZF5 on a rooted LP firmware (.78 if I'm not mistaken), tried looking for a recovery installer, then flashed the recovery. When I have updated the phone to CM13, I've noticed that I've acquired the 'no camera found' bug. I flashed back to KK and did the root which fixes the bug. Now I've downloaded the latest stock LP firmware (.87) and updated the phone. After system update was finished, I've noticed that IMEI was null, so I basically, cellular features were down. Anyone know how to fix this? I've returned it to KK for the moment so that cellular network is working.

I'm downloading stock JB at the moment, will try if this fixes it when I start from JB->KK->LP. :confused:

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