AdrienTouche

I forgot to say that I tried of course my installations with the original and unmodified Hex_Uploader sketch (uploading only to the Mega2560) to see if the behaviour would be...

Hi ! So would anyone have an idea about this ? It's really inconvenient for what I try to do.

Hi ! I try to get a fresh view on this topic because I got stuck on this problem and I'm short of good ideas to solve it. It's been...

Hello ! I'm trying to wake this thread up a bit... Any ideas to make the AtMega2560 hex upload more stable ? Sharing the SPI with other chips should not...

I must add that adding decoupling capacitors doesn't seem to help (thought it's really hard to be sure)

Hi !Thank you so much to take time on this M. Gammon. I didn't know that the uploader wasn't originally designed to upload both code and a bootloader. My idea...

Concerning the failure yes it's during the uploading process, and it says at the verifying step that its wrong. Actually my last bricked Mega2560 chip happened during a **verify only**...

Hello ! It has been driving me crazy but I think I understood some things. First I tried again with High Fuse at D0 or D8 (means bootloader enabled). It...

Then, with High Fuse at D1 it worked quite well, with one of my home made Mega2560 arduino. So I tried an other one home made Mega2560 with a different...

So what do you think ? I think I will try to heavily add decoupling capacitors, and to add a High Voltage Parallel Programming connection on a new design, because...