That makes me a little angry but we cannot against Google since they are decision maker of what is a “good blog” and what is “bad blog”.
Of course, we can get our PR again but all decision are depends on Google again. If you wait for the official update of Google, it’s not sure that PR update will bring back you PR as before, even none at all, moreover it will take approximately 3 months while waiting for a mass update Google.
So the only way to get back our PR as before quickly is by contact Google, or resubmit review of our blog in order that our PR blog can be restored as soon as possible.
Here are the steps to ask Google to review the our blogs:
1. Log in to Google services (gmail, blogger, etc.).
2. Activate webmaster tool Google feature on our blog, it makes our blog are crawled properly by Google.
3. Visit this link, and select list of our blogs we would ask for review. Write reasons to the problems we face in the form that has been provided.
4. After that just wait for Google's reaction. If it successful, our PR blog will be restored by Google approximately in 2 weeks.
This tips may be more suitable for blogger who using Google’s services such as blogspot, including a custom domain. Meanwhile, I do not know how the tips for other services like WordPress . If anyone knows please share the information, please. I just tried this service, so do not know the success or failure. But there is another blogger who has successfully using this methode.