Below is an update for serial number unknown by Gary Keys - technical marketing manager. Although sadly asus technical support is not aware of any fix..... they don't even know about the serial unknown. I find that remarkable, that you have a support department who isn't abreast of the top issues the customers are facing.... I guess I will try option 1 - the email.
1/23/12 Update -
For North American users with the Serial Number Not Found problem that we have not directly contacted during the replication testing cycle we ask that you please send the following information to firstname.lastname@example.org :
Subject: <TF201 SN Not Found – Your Contact Name>
Name: Your Customer Name
Phone: A contact phone number
Email: Your Email address
SN#: Your TF201 Serial Number
Or you can call our North American Hotline at 1-888-678-3688
A customer care representative or technician will take your information, confirm the status of the serial number on our server, ask you to walk through a short procedure to correct the problem. If this fix does not work they will walk you through the next series of steps to correct it.
Note - For those users who provided this information already based on direct contact from us, you will be notified shortly. For those users who provided their serial numbers but were not contacted by us for further testing you will need to either send the email above or call the hotline. We sincerely apologize about this inconvenience but your TF201 will be fixed shortly.
ASUS Technical Marketing Manager