After flashing, you can experience the fantastic marshmallow and if there is any updates you will receive it OTA. Though we have made our best to perfect the software, we know there will still be some mininor drawbacks, so welcome to give your feedback through our customer service (firstname.lastname@example.org) and that’ll be very helpful for further optimization. Due to the issue of 32-bit to 64-bit conversion, it will take time for our engineers to upgrade your android 5.1 Ulefone Power to Android 6 wirelessly. For that, we express our sincerest apology, but we promise this problem will finally be solved. We appreciate more patience from you guys.
Download now the latest Android Marshmallow 6.0 stock firmware for Ulefone Power smartphone from here.