Just purchased the TF201 (used - eBay). OS is 4.0.3 and firmware is iml74k.us_epad-9.4.2.28-20120525. Please tell me if this is the most current firmware and OS release for this product. I see that some of you are on a more current OS which I cannot seem to get to. I have tried the system firmware upgrade but receive the 'no update available' message. The Asus upgrade site is quite confusing as to which upgrade I may need to install. Thanks for any advice offered. carli56