He is getting the error because the updater script checks for the January firmware oreo version as prerequisite for pie update and as he is on February update he gets a build number mismatch error.Yes there is a method to do anything , I am not able to understand your question what exactly are you trying to do?
Lol he was using stock recovery to revert back? Damm that's silly. I thought he messed up with ROM . Well he should wait i mean its less than a month !!!!Nope the recovery will find the zip as tampered as the zip signature verification fails. The only way is via custom recovery, but the stable release is almost here so thats not recommended.