I'm trying to download libopenssl 1.1 for an ac1750 router that is a dependency for another package i'm installing that will allow me to connect to the internet. This seems like a chicken and egg problem, because I can't find the ipk no matter how many ways I google it, and I can't install with opkg since the router is not connected to the internet. Is there some way to find this ipk?
Two direct approaches - and one slightly indirect, but effectively easier:
temporarily putting the OpenWrt behind another router (it defaults to DHCP on WAN), worst case would be connecting wirelessly to a phone hotspot.
manually downloading the *.ipk packages via some other means, uploading to /tmp/ via scp - installing with opkg from there (this is only reasonable for packages without many dependencies)
using the imagebuilder to generate a custom image containing everything you need - and then flashing that.