My DIR-655 A4 is currently on firmware 1.31EU, which has very limited IPv6 support. It can only forward proto 41 to another machine, which can set up a 6in4 tunnel. This has worked fine for years.

My ISP has now provided me with the settings to configure IPv6 via
6rd, a different tunneling method, and I'd like to try it. It seems to be their method of deploying dual-stack so I'd like to help them test it.
According to this page another provider, Swedish Tele2, succesfully uses 6rd on the DIR-655 B1 (and some other models), but makes no mention of the A4 hardware. Check the screenshots on that page to see how the UI looks. My 1.31EU firmware doesn't have that screen.
Before I attempt to flash my router to the newest 1.36EUb01 firmware, can someone please confirm that firmware supports 6rd on the A4 hardware? I found no mention in the changelog, but who knows...
Thanks for any info you can provide,
Martijn!