How to install pip (Python) on Teltonika RUTX/TRB (OpenWRT)

New method (new firmwares from approximately TRB1_R_00.07.10)

First, install python3 using the system package manager via the UI:

Then:

wget https://bootstrap.pypa.io/get-pip.py
python3 get-pip.py

After that, pip will be available.

Tested with RUTX_R_00.07.20.3

Old method (old firmwares until approximately TRB1_R_00.07.10)

You can just install pipon OpenWRT such as on the Teltonika RUTX10/RUTX11 or TRB series using opkg:

opkg update
opkg install python3-pip

opkg update
opkg install python3-pip

Tested on firmware TRB1_R_00.07.02.6.