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Low-pass Filter wiring

i got just one short Question Smile
I managed to install an Attiny45 as LPF, after the Installation of the LPF-Firmware can i unplug some of the GPIO's ?
Are the GPIO's RESET,SCK,MISO,MOSI only needed to Flash the Firmware? Or must they stay plugged in?

Regards Marc
Only used for flashing.
Is there a chance to get a Firmware for the filter to bypass it?
I´d like to test the effectivity of the Filter for me without soldering...
Just directly connect the receiver without using the filter in between.
I agree with @Scarala that a test-firmware = pass-through is useful in many cases. Even automated comparison testing could be implemented.

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