Well, technically, you can, by using software playback, but it will be slow as AV1 is cpu intensive when run on software mode.
No, it's a function built in to the hardware.
I think even the Nvidia shield would struggle to software decode AV1
No
No.
No
You can try.
Well, with a compatible player, yes.
Performance will be quite slow however.
i wanna know too
AV1 support (as other codecs) is mainly present in the SoC chip, that's why only new devices with the amologic S905X4, S805X2, S905Y4 and others have support, you can still decode AV1 by software but playback won't be smooth.