Reset broke OpenWrt. Please help

I factory reset my router and when I tried to download luci, it says that kernel 5.4.68 is required. I have kernel 5.4.66 and attempted to update it using "sysupgrade path/to/file.bin" and "sysupgrade path/to/file.img", but it says "Image not found". What can I do?

I have a Netgear r6020.

Download today's snapshot image

Then scp this image to your router's /tmp directory and run sysupgrade with it. Then install the packages you need on the same day.