You can flash an older rom as long as it does NOT contain a bootloader. Trying to flash an older bootloader while on a knox bootloader will result in a hard brick.
Now an older rom may or may not play well with the newer baseband so you could possibly get a soft brick if it doesn't, but it's at least fixable.
Now an older rom may or may not play well with the newer baseband so you could possibly get a soft brick if it doesn't, but it's at least fixable.
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