The hybrid gadget is one of the first third-party devices to receive the update, which was rolled out over the air last weekend.
Jelly Bean introduces a raft of new features to Android, including speedier navigation, refined voice searching, and the Google New information service.
The Asus Transformer Pad 300 was released in the UK back in May. It features a quad-core Nvidia Tegra 3 processor, integrated 12-core GeForce GPU, 32GB of internal memory and an 8 megapixel camera.
Android 4.1 launched with the release of Google and Asus' Nexus 7 tablet, and will soon be rolled out to selected devices from Samsung, Motorola, HTC and other manufacturers.
The Asus' Transformer Pad Infinity is also expected to receive the update in the future.