Pksploit stuck waiting for StatusMQ from Arduino when writing to SRAM #2

I tested this on my two GBA SPs with a German pokemon blue and a bootleg "cock" version that is based on the American red version.
The arduino I use is an Uno R3.
When I select to restore a save, the program gets stuck at line 666 and only prints "no" a lot of times to bash.
After commenting that part out it writes a garbled save that doesn't trigger the exploit on startup.
Could you also add on the readme, that you need to hold down the mode switch of the GBA with some sort of cardboard?
Otherwise you can't switch games after triggering the exploit as it reboots to GBA mode then.