Put the HC-05 in to AT mode (hold the button switch closed while powering on). If you are not sure how to do this seeArduino with HC-05 (ZS-040) Bluetooth module – AT MODE. When in AT mode the LED on the HC-05 should blink on/off every second. First, check that we are in...
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i would say it's best to check for step by step guides because you could brick the printer if you make a wrong step, you also have to have an Arduino and wire it up to the printers control board and then link the Arduino to a PC to be able to flash the bootloader to the ...
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