Unable to flash software using Odin

I’m trying to flash over an updated version of firmware to my S9+. I did so about a year ago. Was an AT&T phone originally, but flashed T-Mobile software over. Phone has been working fine. I’ve tried 2 versions of Odin, and about 5 different T-Mobile versions of firmware. Odin just comes up saying it failed. I’ve never had an issue using Odin before. Any ideas what it could be? Thanks

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