Thanks for all the hard work!
I couldn't upgrade my GL.iNet GL-B1300 (soft-bricked, rolled back to v19.07.2 via TFTP). Updated: the issue with GL.iNet GL-B1300 has now been resolved.
I've successfully upgraded Ubiquiti Edgerouter X (via sysupgrade), GL-MT300N-V2 (sysupgrade), TP-Link TL-WR902AC (sysupgrade failed, TFTP recovery worked).
On all my v19.07.3 devices I'm having an issues with luci-app-https-dns-proxy where it doesn't show up in Services menu, same as a few other folks in that thread. This was also an issue on v19.07.2 if I manually upgraded luci-app-https-dns-proxy. Updated: also resolved.