Which update did you download @Marchy23 ?
My latest one didn't cause any issues on my phone.
You could try two troubleshooting tips.
1. Turn the phone Off and then from a set series of button presses go into the phone's System files and clear the cache files.
2. Back up and remove any relevant sd card and factory reset.
Current Phone ~
Samsung Note 20 Ultra 5G SM-N9860_256Gb SnapDragon 865+
Samsung One Ui 3.1/ Android 11.