Electronic – Lilypad upload error

You could possibly solve the problem by trying the following variant of your approach:

Edit avrdude.conf (located in \hardware\tools\avr\etc) by going to the Atmega328P entry and then replacing "0x1e 0x95 0x0F" with "0x1e 0x95 0x14".

In other words, REPLACE Atmega328P's expected signature with that of Atmega328 (i.e., NOT make a separate entry, but instead actually replace... so as to essentially attempt to trick the IDE).

Be sure to restart the Arduino IDE after saving the .conf file.

Now, continue with "Upload using programmer", with Atmega328P board (i.e., the original) selected.

If that fails, you may instead use an FTDI board/cable to upload, if circumstances allow.

While building an arduino I experienced similar issues. It came down to two things:

1) Some circuit error on the bootloader TX/RX lines that had an accidental short and caused it to not respond

2) Bootloader file I used was incorrect, despite the fact that it downloaded perfectly fine and transmitted and all the instructions told me to use that one. The issue was something in the configuration that apparently changed the baud rate and hence the BSL failed.

I recommend you use a logic Analyzer or Oscilloscope to look at the lines and see what is going on. Some of the things you need to look for is:

1) No Data and lines don't start in their default state

2) Baudrate or speed incorrect