You may have a bad SD card (I went through a number of defective cards that I purchased on ebay from sellers in Asia), I had to break down and pay full dollar here in the US. I downloaded a program called h2test2.exe which does a full SD card read/write test. I highly recommend it.
uppss!!
I know what the problem was.
I was trying to update the Droid Pro from 2.26.20 to 3.8.7 and I forgot first update to version 2.26.60... daaaaaaa....
The thing is that my phone is not activated, and i'm trying manually.
Someone has the update version 2.26.60??
please post it.