What a mess. The best search I can do is TL-R600VPN. I get 621 pages to wade through and no way to filter that. I should be able to limit to Firmware. Mine is v. 4. More confusing is that the whole world is represented there. Thailand, Argentina, Australia. If the engineers at TP-Link will say that other than language it's all the same, then OK. But the forums would be less struggle if the devices were divided by geographic area.
Firmware version NOT searchable
2019-01-13 20:12:58 - last edited 2019-03-12 08:56:22
Linux Ubuntu 18.04 LTS (Bionic Beaver). TP-Link TL-R600VPN