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You can download the available Android firmware archive below:
To be able to install a specific Android version you first need to partition your device to accept custom OS. In order to do this you will have to re-partition your device, which will lead to the loss of all your data. If you already have partition your device you don't need to do it again.
To change the partition table of your Cosmo use the option "Change the partition table of your COSMO", as in the picture below.
* Reinstall Android V19 (Factory Reset)
Select the appropriate OS and press the Enter key. If you see a screen asking to select where to install the custom OS (for example in EMPTY_RECOVERY_BOOT_2, EMPTY_NORMAL_BOOT_3 or EMPTY_NORMAL_BOOT_4), just select any available option and press Enter again. The Android firmware will overwrite the standard Android and will not affect any other custo custom OS that you might have installed.
After the installation is completed, reboot the unit. A boot menu will then appear when you turn ON the device, allowing you to choose what to start as in the following picture.
After the Android firmware installation you can repartition your Cosmo to only store Android and regain the space used by reserved for Linux, if you want to.