The US FCC backed off on preventing users from flashing the firmware on their routers, as long as they do not operate outside authorized radio frequency band, not that this had anything to do with why users wanted to flash to DD-WRT.  This has not stopped TP-Link from doing so, as of now they will not sell routers which allow a user to install customized firmware.  Assumedly this is a CYA move to ensure that they cannot be sued if someone does change the frequency limits, output power, country codes or other banned modifications but is more likely to cause a decline in their sales.  The Register has more on the decision from the FC and TP-Link here.

"In a brief statement and FAQ published this week, TP-Link – which is based in Shenzhen, China – said the FCC's revised rules on radio-based equipment makes user reprogrammable firmware illegal in America, and therefore it cannot sell in the US routers that can be re-flashed by their owners."

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