Upgrade Oysters Atlantic 454 to Android 6.0.1 Marshmallow
Download latest firmware Android 6.0.1 Marshmallow for smartphone Oysters Atlantic 454
The latest firmware android 6.0.1 marshmallow, starting upgrade from a PC with Windows 10/8.1/8/7/XP (this is a custom firmware for this smartphone, you install it as is).
The driver of the USB and software to update the firmware of the smartphone (run the .exe file for help on upgrading and starting the update).
Root firmware android 5.1.1 lollipop (rip from original firmware oysters atlantic 454).
Update firmware for other Oysters smartphones.