The software version of this update is G988FXXS2ATD5, G985FXXS2ATD5, and G980FXXS2ATD5 for the Galaxy S20 Ultra, S20+, and S20 respectively. The size of this update is around 170MB.
This update may also contain fixes for overheating and some display problems. It is currently rolling out in European countries and expected to be available to other regions very soon.
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If you want to check for the update manually, just head into the device Settings, tap on the Software update menu and go for the Download and install option.