Got the update to take after numerous failed attempts
It took some drastic steps though...
Just a reminder.... There is no turning back if you flash with a new sbf.... and there are so many chances to brick your phone.
First I loaded a 2.3.20 FULL SBF file that I located from this link.
(There was at least one of the download links for the sbf that was still working)
TBH & MyDroidWorld Present: Droid 2 (2.3.20) Triple Threat
I highly recommend reading through the thread to pick up tips and tricks.
After successively loading the full sbf and truning my R2D2 droid into a stock Droid 2 unit I loaded the on-line update and everything worked OK.
Well mostly OK ... I could not use any of my rooting programs to root the newly updated phone .... sigh... back to Google to hunt for a fix...
I found it here...
Pete's Motorola Root Tools
Yes, it says it's for a Droid 3.... But it works for my R2D2 masquerading as a Driod 2 now.
It's not perfect, but it worked for me.