Wow, I'm jealous you live somewhere that you can downgrade to 2.5Gb/s!

If you go that Banana Pi route, just be aware that the process of getting mainline OpenWrt on the thing is a little unusual, but not difficult at all. Just requires a cheap serial adapter and spare micro sd card.

There device has onboard NAND, NOR, and EMMC, as well as the card reader. Not all can be used simultaneously, so there are dip switches that set what is booted/visible.

Official install method is basically as follows:

-Hook up serial adapter to the send/receive/ground pins on the board, open serial terminal in something like PuTTY

-Set dip switches, boot the sd-card

-In serial terminal select option to install to NAND

-Power off, change dip switches, boot to NAND

-In serial terminal select option to install to eMMC

-Power off, change dip switches

-You're done, now booting mainline on eMMC

Basically just putting the image on the NAND memory temporarily so it can be put back on eMMC since eMMC and sd-card can't be used at the same time.

The Banana Pi forums are a good resource in addition to the OpenWRT docs.

My only gripe at this point is that the mainline configuration by default only sets up a 100mb partition on the eMMC to install packages to. Some folks have had success resizing that partition but I wasn't having any luck there, so I may just compile it myself and set it larger. That change should be persistent through system upgrades after it's done once.

Anyway, if you or someone reading this goes that route, I hope this helps!