I received my Galaxy S 20+ last week and this Monday I transferred the simm from a Galaxy S 8 I had been using. The data and applications migration were smooth and everything worked perfectly, including the SD Card, it even asked if I wanted to use the card for photos and other stuff. It worked fine all day, it then advised me of a new update and it was scheduled for 2:00AM. Next day I received the messages that update was done and also it was not able to write to the card, only read. I removed it and installed in the old phone and works fine so it has to be the update.