"EM is an advanced debug mode. If you want to entry the EM, please entry the developer options at settings"
, then you need to activate the developer mode in the device.
Usually, for this you need to open the "Settings" - "About the phone" and find the item "Build number", now you need to tap it 7-8 times - a pop-up message "Congratulations, you are a developer".
After that, the settings should appear "For developers" - go in and click "enable".
!!! Attention 2.
On some devices (basically, these are some models of Huawei) manufacturers denies access to the Engineering Menu, in connection with which these devices will be able to function the program only with the given Root access.
For those who would like to support the project, offer donate-version: Engineer Mode MTK donate