Android 4.3 Jelly Bean release date is expected to be this month for a number of Samsung’s old devices. According to the International Business Times, the new OS is popping up recently in the form of leaked firmware for Samsung Galaxy S4 and Samsung Galaxy Note 2.

SamMobile shared an Android 4.3 test firmware for a few days and noted that it’s really stable and the performance has received a significant boost. The Samsung-focused blog wrote that its faster and lag free than Android 4.2.2. In sharing the test, SamMobile explained that Samsung Knox and Samsung Wallet are present in the test firmware.

“Samsung Knox works like a charm but Samsung Wallet can’t be downloaded from Samsung servers at the moment,” SamMobile shared about the test. The site also wrote about the new Reading Mode, which optimizes the screen for reading, but only a few specific applications are able to use the feature. The Android 4.3 test firmware improved color reproduction quite a bit and the text looks sharper than before.

In a report by the Business Times, it noted that the website tinthe.vn leaked another Android 4.3 test firmware, this time for the Samsung Galaxy Note 2. The build version N7100XXUEMI6N7100XXUEMI6 is available for download specifically for the GT-N1700 model of the Galaxy Note 2. It is the first Android 4.3 leak for the famous phablet.

The Android 4.3 test firmware for the Samsung Galaxy Note also included the Samsung Knox and Samsung Wallet and has UI elements that can be spotted on the Galaxy S4 and Note 3. According to the Business Times, the Android 4.3 update for the Samsung Galaxy Note 2 is expected to even have more features by the time its ready for release.

There have also been earlier reports of tests on the Android 4.3 on Samsung Galaxy S3, which Samsung said will receive the update this year.

Android 4.3 Jelly Bean’s expected rollout schedule for the Samsung Galaxy S3, Samsung Galaxy S4 and Samsung Galaxy Note 2 may all involve the international versions of the said devices. U.S. models, the Business Times said may not see an Android 4.3 update until much later because of carrier-specific testing and required certifications.