I've built this repo: https://github.com/stas2z/openwrt-witi
with the following commands:
git clone https://github.com/stas2z/openwrt-witi.git build-dir
cp feeds.conf.default feeds.conf
cp config_example .config
./scripts/feeds update -a
./scripts/feeds install -a
make menuconfig (load and save)
Then I flashed the WITI with openwrt-ramips-mt7621-witi-squashfs-sysupgrade.bin.
After that I can't use network on WITI (but wifi is available).
I've tried to flash u-boot but it didn't worked.
I'd like to ask you to write something about this problem to get closer to the solution.