The engineering menu of the mobile phone exists for debugging the device. Sometimes you exit it by simply pressing a certain button, and sometimes it requires a whole series of actions.
Necessary
service manual for your mobile phone
Instructions
Step 1
Download the service manual for your mobile device model, usually it contains special codes for exiting the engineering menu. Please note that it should not be confused with the regular user manual, it does not even contain the usual service codes. Such manuals are usually quite difficult to find in the public domain; they are also often written in the manufacturer's language, which does not make it easier to exit the engineering menu.
Step 2
Exit the service menu of the mobile phone using the red call rejection button. The on / off button of a mobile device may also work. Try to press and hold it for a certain time, it is quite possible that the service menu closes in this way.
Step 3
Find on the Internet a combination for exiting the engineering menu, corresponding to the model of your mobile device. Usually such information can be found on thematic sites and forums dedicated to mobile phones of certain manufacturers.
Step 4
Reflash your mobile device to exit the service menu. To do this, you need to have a special firmware cable, software according to the version installed, a flash card, and so on, depending on which firmware method is typical for your mobile device - in some cases, the update occurs from a memory card, and in others - from the computer when the device is connected.
Step 5
If none of the points helped you, contact special service centers for the repair of mobile phones, it is quite possible that they will help you fix the problem with exiting the service menu. Next time, try not to use these codes unnecessarily, as this does not always have a good effect on the phone's performance.
