Just yesterday, I changed my router for my company.
I found openwrt 18.06.3,
so I downloaded it. Now the router has become our company's main route and is in use.
But now the problem arises.
I'm going to install zerotier for it, but I found that
opkg update returned an error.
When I checked the erroneous urls, I found that they returned 404.
So I browsed downloads.openwrt.org again.
I found 18.06.3 disappeared.
I tried to use the 18.06.2 software repository, but the installation prompted the kernel signature error.
Then I plan to use SDK to compile ipk.
But I found that I didn't download the corresponding version of SDK at all.
What should I do now?