oric_dan:
tack:
I managed to find the libraries to use your sketch.O...M...G...It works!! 127k Sketch uploaded several times.
Fantastic work.
So, just to be sure, this is using the 0xF7 fuse setting, and no low-pass filter on RX0?
Correct.
With the Low Fuse Byte set at 0xFF, the default with the maniacbug files, a 10k series resistor in RX0 fixed upload.
Changing the Low Fuse Byte to 0xF7 cured the failed upload issue completely, with no series resistor or RC filter required at all.