Can't install comgt from LuCi because it is not available in any repository

Are there other ways to install this package?

it's available in 19.07, 21.02 and 22.03-RC6, which release are you running ?

Powered by LuCI openwrt-21.02 branch (git-22.213.35964-87836ca) / OpenWrt 21.02.3 r16554-1d4dea6d4f

forgot to update the package list, before you tried to install it ?

can't help you further, since you're not telling us what hw you use.

I'm using Xiaomi Mi WiFi R3:

OpenWrt for this device was compiled by enthusiast and works great exclude comgt problem.

I want to install luci-proto-3g but can't because error: Required dependency package comgt is not available in any repository.

Other packages are OK.

Then you should install the official openwrt version, or we really can't help you.

All right! I didn't know that MIR3G firmware is compatible with my device. I'll try and come back later.

make sure the devices are the same, or you risk bricking your router.