thanks for replying, i saw a post same like mine in XDA who had same issue after update, there a person gave me this link to try [link removed] I was about try this but just thought to post a question here if somebody agrees with it.
after updating my samsung j7 nxt to oreo my phone now doesn't have oem unclock option. I neede it as my phone has baseband version as unknown so to fix it i need to unlock OEM. Thanks,