RPi zero 2 w - octopus 1. 1. GPIO

Hello, I planned on having the zero connected via gpio pinout. Zero powers on when I turn on the printer but when I'm I want to flash the board (http://RatOS.local/configure?step=1), ratos does not detect it.
Question: can the installation be done via gpio or is USB needed?
Q2: if yes, what could cause the problem? Assume the zero is connected correctly (5v,gnd,rx,tx). Any jumpers that should be removed or something like that?
Many thanks in advance!
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