Post [Q] Can i recover my imei?

Hello, after flashing a custom rom I think I've corrupted the efs and now my imei and my network are 'Unknown'

I didn't do any backups and all i want to know is if there's any solution or i'm resigned to leave my phone like that? or if flashing back to stock room would help? or if there's a way to try to recover my imei?

I've read threads about this issue and i don't mean to bother, but i haven't tried anything yet just because i don't want to keep messing things.

So please help and thank you in advance!!