Hi,
That's good news... I'm glad that finally was easily resolved...
My thoughts were a possible bad SSD for some time, but considering how finicky things can be when messing with possible UEFI\Legacy issues, it is not an easy thing to determine...
I would hate to prematurely tell someone to return a product, and then have them run into a problem as a result, or find out the product was not the actual problem...
The stuff about how the flash drives are made, the different requirements for the boot drive, combined with multiple bios settings really complicates things...
You may be doing everything correct, but I\We may not be sure of that without asking tons of questions and making multiple suggestions...
It makes matters even a bit worse when there is more than one person offering advice, and their opinions differ..