Samsung Galaxy S3 owners still have a chance to get the Android 6.0 Marshmallow update, not from Samsung, but from an independent customized ROM. The ROM is a stable firmware based on AOSP Marshmallow.
Gammerson says that the Anroid Marshmallow ROM will work on Samsung Galaxy S3 model no. GT - i9300, but further adds that S3s from sprint, T-Mobile, AT&T, US Cellular and Verizon are not supported by the ROM.
The last update that Samsung gave for the S3 handset was the Android 4.4 Kitkat and stopped giving updates from that point on, says Master Herald. So when version 5.0 came out last year, Samsung was already excluded from the list of devices to receive the new firmware.
Though the 4.8-inch screen device is only three years old, that age is already considered 'old' by tech standards, thus it is no surprise that Android 6.0 Marshmallow will not be directly available for the model. However, some Samsung Galaxy S3 users have not lost hope because there will always be XDA developers to the rescue.
A number of custom ROMs will start rolling out in the next few weeks. Little by little, more XDA developers are releasing the AOSP for Android Marshmallow for the old Nexus 4, which is expected to be where the custom ROM for the Galaxy S3 will be based from, according to NSEA Voice.
Getting the ROM is pretty simple:
First, users who are interested in 'risking' it, should download all the files necessary from the XDA developers' sites and forum posts. Then place all the .zip files in the phones internal or external storage.
After that, one must boot into TWRP recovery, then perform a factory reset. Only after that will users be ready to install the ROM files by tapping on install from TWRP's home screen, then locate the .zip files you placed earlier and swipe to flash. The final step would be to reboot the device.
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