Restored to Monterey but it still wants to update to 26

Hi all. My 2015 mbp updated to Tahoe accidentally on olcp soI created a usb installer with Monterey and wiped and installed. Now it wants to update.to 26 on the fresh install. Is there.any way to get it to stay on factory fork of updates? 2015 mbp now is redundant and should not get 26. Olcp is no longer installed.