Troubles with new 2.22.2

Updated today to latest stable 2.22.2 and since i updated i had all kind of instabilities on the rtk fix. On old 2.22.1 in same location we worked 10 days with never a problem.
I tried to reflash 2.22.1 but now the unit always goes in updater mode and wants me to update.
Isn’t it possible to revert to 2.22.1 without the unit going in updater after flash?