[Sovled] Rollback options

I need to roll back Everett update1due to an issue of not being to open SampleTank 2XL. The rollback options available are 21.4.0.27 followed by 21.3.0.20. I do not want to rollback Everett, just the update1 to Everett. If I rollback 21.4.0.27 to 21.3.0.20, will I lose the entire Everett update? I’m asking because I do not know what the build number was prior to update1. Examining the rest of the previous builds, it appears that the rollbacks only apply to the entire version. If this is the case, can I perform another update to Everett without updating to update1?
 
Thanks in advance