No you cannot put flat mount calipers on a non-flatmount frame, no adapter exist. You could use post mount calipers but i’d avoid that
Why avoid using post mount? Post mount still work fine, sure you can get the calipers from a previous groupset
The new gen shimano stuff is optimised to use with the shifters; modulation is incredible; if you put old calipers on that, it negates the whole point of ‘upgrade’
@andyfallsoff started
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No you cannot put flat mount calipers on a non-flatmount frame, no adapter exist. You could use post mount calipers but i’d avoid that