Quote:
Originally Posted by Sephiroth
BTW my router in this case is the Airport Extreme which doesn't support 40 MHz for 2.4 GHz.
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That would be my point. The router hardware *does* support it, Apple just won't allow you to turn it on. Similarly even if you did turn it on, your devices would still have it disabled. Last iPhone I came across had it permadisabled even on 5Ghz though newer ones seemingly don't.