A “Serial Number – Unknown” issue prevent them from upgrading
Keenly expected by every Transformer Prime owner out there, the Android 4.0 ICS firmware update hasn’t went as smoothly as it was supposed for all TF201 users as some report that a “Serial Number – Unknown” issue prevent them from installing Ice Cream Sandwich on their tablets.Quite a number of users have reported these type of issues since the update was rolled out by Asus, some of them starting a thread on the XDA Developers forums to complain about the problems faced.
To address these issues, Asus’ Gary Key has posted a workaround that involves resetting the tablet back to its factory settings, but this doesn’t appear to work for all those affected.
“As for the Serial Number Unknown problem, please try doing a factory reset. If it does not work the first time, after the reboot, please try it again and once at the desktop, wait about 10~15 minutes for the system to sync with the server.
“So far this has worked for users I am directly assisting at the moment on another forum but it has not worked on two particular units that were returned yesterday.”
Despite providing users with a possible fix, Asus hasn’t published any official statement regarding these Android 4.0 upgrade issues, since they are unsure of a solid fix for the problem.
Asus has started pushing out the Android 4.0, aka Ice Cream Sandwich, update for the Transformer Prime on January 10, and this was sent to its users OTA.
Shortly after, the first “Serial Number – Unknown” reports started to make their way to the Web as some users uncovered this issue prevents them from upgrading to the new OS.
In addition to the Android 4.0 upgrade problems, Asus has also confirmed that some users may experience a "Random Lockup or Screen Corruption" problem after the new software is installed. Right now, the company is in the process of qualifying a fix for the issue.