Installing OpenWrt on Gl.Inet GL-AR750s EXT (slate)

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Newbie with GL-AR750S-Ext

So... new guy here Picked up a GL.inet AR750S-Ext earlier this year, and it worked well enough... for a while. Now it's getting increasingly unstable (drops wifi entirely, lucky if it lasts a couple hours) and it was suggested to me to give it a new lease on life by using regular OpenWRT, rather than the vendor-provided version. After a bit of digging around, and a bit of trial-and-error, I've reset the router and brung up the uboot interface, following the directions here. After some…