Oh boy, direct down vote instead of looking on your own or asking...

http://eur-lex.europa.eu/legal-content/EN/TXT/HTML/?uri=CELE...

http://www.tp-link.de/download/Archer-C7_V2.html#Firmware 1.For Archer C7(EU)V2. 2.The EU firmware was specialized for CE certification and can't be downgraded to other version, please click here for choosing your region and selecting the most suitable firmware version to upgrade. 3.Old firmware's configuration file can be imported into this new firmware; 4.Your device's configuration will be lost after upgrading, which means you need to configure your device again

All routers are doing the same. EU law.