MT-300N-V2
Yes, it had maxed file system when I was installing other packages. Reverted firmware and reloaded fine. Thanks.
Then, I did:
opkg update
opkg install tinyproxy
vi /etc/tinyproxy.conf
tinyproxy -d
and tested from another computer with:
curl -v --proxy http://192.168.8.1:8888 https://icanhazip.com/
and got the IP of Mango’s WAN hotspot so it worked fine.

But how can I get the service to startup at boot? I went to luci and selected tinyproxy but luci commands don’t seem to work. What’s the GL.iNet way of setting this up? I noticed tinyproxy was listed in init.d:
root@GL-MT300N-V2:~# ll /etc/init.d/ | grep tinyproxy
-rwxr-xr-x 1 root root 3422 Jul 26 2018 tinyproxy*
but a reboot doesn’t start the service. I’m confused.