Although the Asus Transformer TF300T already has had Jelly Bean for a few weeks now, it seems that Asus still wants to make sure that it's running just right on the tablet. We have word that a new software update has been rolling out OTA for the device. This one is designed to improve stability, although not much more than that is known. The new update is version 10.4.2.13, and will supposedly not clear any of your data. If you wish to manually check for the update access Settings –> About Tablet –> Software updates.
For those who have it and want to share, or if you just have questions about it, head over the the source link below.
Source: TransformerForums