Download Elephone M2 Flyme 4.5.3i ROM based on Android 5.1 firmware from here or from here. Download latest Android Lollipop 5.1 stock firmware for Elephone M2smartphone from here.
Archive:Elephone M2 Flyme 4.5.3i
Firmware image file name: flyme 4.5.3i
Platform: Mediatek MT6753
Archive size: 683 MB
Important: You’d better conduct factory reset and wipe cache partition first. Back up your phone before factory reset. If there are some errors during flashing, you can flashofficial rom first and then try again.