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Marshmallow was released last fall, in October and now it runs on 10 percent of all active Android devices. Some of the Asus devices launched in 2015 that were upgraded to the latest 6.0 Marshmallow are Zenfone 2 Laser ZE500KL and Zenfone Max ZC550KL and now two more smartphones are catching up: Zenfone 2 ZE551ML and ZE550ML.

The two aforementioned devices will get the Android 6.0 Marshmallow update over-the-air and the installation file will weigh 1.1GB, which means that users will need to connect to a WiFi network in order to download it. The update brings many new features (Google Now on Tap, Doze mode, app permissions), improvements, bug fixes, but Asus has also removed a god deal of bloatware. If users can’t wait until they will receive the update notification, they will manually install the update by follow the Source link for download links and instructions.

Both the Zenfone 2 ZE551ML and ZE550ML were released in March 2015 with curved plastic bodies, which measure 152.5 x 77.2 x 10.9 mm and weight 170 grams. They share a 5.5-inch screen, but the former model supports a Full HD resolution, while the latter is settling for a HD resolution. Also, one of the two variants of the Zenfone 2 ZE551ML has the same configuration as its sibling, being powered by an Intel Atom Z3560 Quad-core 1.8 GHz processor backed by 2GB of RAM and PowerVR G6430 graphics, while the top end variant uses an Intel Atom Z3580 chipset with a Quad-core 2.3 GHz processor backed by 4GB of RAM and PowerVR G6430 graphics. The Zenfone 2 ZE550ML has only 16GB of internal memory expandable up to 256GB, while the Zenfone 2 ZE551ML offers two more variants with capacities of 32GB and 64GB. Also, both phones have cameras with resolutions of 13MP (back) and 5MP (front) with the same aperture of f/2.0 and the batteries are identical, with a capacity of 3000mAh.