madires, there is a suggestion to implement the possibility to disable the "Selftest" option in the firmware? This will save some memory, as this procedure is usually done only a few times when hardware problems are detected. Now I disable this option myself if I compile the firmware for myself. If I am sure that my circuit is correct, I only need the "Self Adjustment"option. If any strange results appear, you can always enable self-test if necessary or use the standard firmware where this option is enabled.