The official Android 6.0.1 Marshmallow update for Samsung Galaxy S6 is currently available. However, adventurous Android users can opt to use a custom ROM for the firmware upgrade.
According to Team Android, Samsung Galaxy S6 users can utilize the custom firmware called XtreStolite to install Android 6.0.1 Marshmallow OS on their handset. The ROM is specifically compatible to the global variant of the device or those units bearing the model number G920F. The post noted that the XtreStolite ROM is “basically stock Samsung firmware with the difference of being deodexed and debloated,” allowing users to get the most out of their Galaxy S6. The firmware offers a stable and quick performance.
But since this is a custom firmware and is an unofficial way to update the Samsung smartphone to Android 6.0.1 Marshmallow, users are expected to be more careful during the installation to prevent bricking or damaging the device permanently. There are several prerequisites that will highly ensure a safe and successful installation.