Hi @kevin7711 welcome to the /e/ Forum.
I guess you are aware that this is very much associated with RMM or KG Prenormal. The Odin Mode screen on a “newer device” may not display the status of KG or RMM State Prenormal. [1]
Just checking we are talking about the 2020 tablet https://doc.e.foundation/devices/gta4lwifi.
Two results to share from searching
- https://xdaforums.com/t/security-error-this-phone-has-been-flashed-with-unauthorized-software-is-locked.3987153/
- https://www.justanswer.com/android-devices/lax9q-tablet-updated-software-locked.html
Some YouTube videos also came up in the search.
In my brief reading it looks as if Odin flash of Stock ROM might be called for.
You are booting into Download mode OK – neither the device nor install page really describe the way that connection of the USB Power seems to work as a trigger.
[1] Know your hardware - Samsung #KG or RMM State Prenormal. (Your two errors are not yet specifically covered there.)