An anonymous reader points to an official announcement made by TP-Link, which confirms a report from last month that it is blocking open source firmware
: The FCC requires all manufacturers to prevent users from having any direct ability to change RF parameters (frequency limits, output power, country codes, etc.) In order to keep our products compliant with these implemented regulations, TP-LINK is distributing devices that feature country-specific firmware. Devices sold in the United States will have firmware and wireless settings that ensure compliance with local laws and regulations related to transmission power. As a result of these necessary changes, users are not able to flash the current generation of open-source, third-party firmware. We are excited to see the creative ways members of the open-source community update the new firmware to meet their needs. However, TP-LINK does not offer any guarantees or technical support for customers attempting to flash any third-party firmware to their devices.
Don't lose all your hopes yet. Developer Sebastian Gottschall, who works on DD-WRT Linux-based firmware, believes that TP-Link hasn't blocked third-party firmware
. He adds, "Just the firmware header has been a little bit changed and a region code has been added. This has been introduced in September 2015. DD-WRT for instance does still provide compatible images... in fact it's no lock." Furthermore, Cisco insists that FCC's existing or proposed rules doesn't limit or eliminate the ability of a developer to use open source software