I also wanna say thanks to @xhaka. I understand you're not willing to compile anymore, but I am still working on my "pimp my old device" to 16MB flash and 64MB RAM. The upgrade from 4MB to 16MB worked on one device. I hope it will also for the others. - It would be great to get some pre-build-images for this improved devices!
Maybe someone will also still find a way to bring back the devices in original mode to new life until 5 GHz support is finally proper with other devices in Openwrt. - It's unfortunately still a completly mess with the buggy or even no driver support!