[Solved] Configuring/updating OpenWrt after flash

@psherman could you please split everything from post 3 in:
https://forum.openwrt.org/t/clear-step-by-step-installation-guide-to-flash-openwrt-to-fritzbox-7530-purely-via-windows/144225/3
into its own thread? Starting there was probably fine, but it developed quickly into an off-topic sub-discussion for that thread.