It's just a hobby, don't let missed opportunities trouble you.
After additional thought I wonder if you might have inadvertently "glitched" the ccm's boot process while connecting the charged battery (a process that is generally very hit-and-miss with plenty of arcing when the bolt makes contact). This takes me back to the satellite card days when the hacker du-jour was to switch the card's power / vcc line to ground at strategic times after power-on in an attempt to cause the bootloader to skip critical instructions. For the Y body ccm the spot you might have skipped was the region where the eeprom was copied to ram.
Unfortunately and likewise, life events have made it so I won't be bringing the C4 home this winter for paint and other final restoration processes as was originally planned. So I won't be quite as able + motivated to work on it as I likely will be to continue working on my 0411 programs for ecmhack and doing minor restoration repairs on the C5. I'd really like to get the C4 "done", but my employer is moving in the coming months and I'm going to need reliable transportation throughout that process and my "plan a" for that resource (reliable transpo) was just recently flushed down the bowl.
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