Improve reliability of pinprocfw

[tomlogic]

Multiple users have reported issues with the verify stage of a pinprocfw update failing. It's unknown whether the writes are failing or the reads are failing.

First step could be to provide additional error information on the verify to see what exactly is failing.

But another step might be to try re-reading data if a read fails. Or reading back each page as it's written and re-writing any failed pages.

This appears to be affected P3-ROC only. Any users who have experienced trouble installing should comment on this issue with information on the build they used, and whether it was a P-ROC or P3-ROC.