For Software update information you should be able to see the update notes and fixes that they implemented on the update. to view the patch notes/ Change Log you should go to
Settings > Software Update > Last Update . the information of the update should be indicated on it.
for previous updates, the changelog should be on T-Mobiles website "example https://www.t-mobile.com/support/devices/android/samsung-galaxy-s20-ultra-5g/software-updates-samsun..."
hopefully, this will help with you
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