First verify firmware is the latest. 5GHz band will always be faster at the same distance vs. 2.4GHz whereas 2.4 will have better range than 5GHz as higher frequencies do not pass through obstacles...

@EdS56 Can you log into the router setup and verify the wifi radio bands are enabled? If they are checked, and still not working, uncheck, apply, then recheck the boxes and apply. See below image for...

@Alkaiser Yes. The v1.60 would be the same as v1.6. If you are still uncertain, snap a pick of the label and post it blacking out any details you would not want to share.