How does the iPhone enter engineering mode?

Steps. If you want to put the current machine that can enter the system normally and can be used normally, let it enter recovery mode, please first press and hold the power button on the right side of your iPhone6, as shown in the figure.

<>Next, connect your iPhone6 to your computer and open the iTunes software, if you don't have the iTunes software installed on your computer, go to the official website**.

Then follow the steps below, if it doesn't work once, try a few more times:

The first step is to press the power button to turn on the computer, when the Apple logo will appear on the screen, do not release the power button;

Step 2: Then press and hold the home button on the home screen until the screen goes black.

Step 3: When you see a black screen, release the power button and continue to press and hold the home button on the home screen until iTunes on the computer detects an iPad in recovery mode.

In addition, sometimes, when we are upgrading and updating, if we encounter unexpected circumstances that cause the update to fail, the iTunes connection screen will appear on the iPhone screen. At this time, the phone system crashes due to the failure of the update, and it will automatically enter recovery mode, and the iTunes software on the computer can also be used to restore the system. Therefore, it is recommended that before updating the system, if the data on the mobile phone is more important, such as **, contacts, text messages, etc., it is recommended to use iTunes on the computer to make a backup before the update.

It won't be that the motherboard font library is broken, so you have to send it to customer service.

The iPhone project mode is the Field Test mode, and the steps to enter it are as follows:

One: Find the ** app in the main interface and click to enter.

Two: Click on the dial pad, enter *3001*, and then click the green button to enter the engineering mode.

Three: The engineering mode involves many system settings, please do not change them at will without the understanding of Jian Fan.

If you use vivo mobile phone, the engineering mode is tested by the engineer, it is not recommended to enter this mode, if the settings of the engineering mode are modified due to misoperation, resulting in hardware problems, you will no longer be able to enjoy the warranty service. If you need testing equipment, you can go to the vivo customer service center.

Customer service center address: enter the vivo official website vivo**app--my--service outlets after-sales outlets--select provinces and cities to inquire about the address of the customer service center;

Tips: It is recommended to bring relevant purchase vouchers (such as: purchase invoice, warranty card, ID card) when you go, and consult the staff of the consulting center in advance to ensure that the staff go again during normal working hours, avoid empty running, and pay attention to safety on the way to and from the service.

1. Apple mobile phone engineering mode** is to dial keypad input *3001 * and then press the dial key to enter the engineering mode, the mobile phone signal is displayed in numbers, all negative numbers, generally speaking, above -88 Apple will display a full grid signal. Its unit is dBm. After entering the engineering mode, you can also see relevant information, such as which hidden filial piety cell occupied by the current signal and cell ID.

However, it shows hexadecimal and needs to be converted to decimal decimal.

2. Engineering mode, as the name suggests, is a mode used by engineers to debug mobile phones. It seems unfathomable, but it is not as complicated as everyone thinks, and engineers can obtain some base station information in it, such as signal strength, battery status, mobile phone running time, background software running time, and of course, WLAN can also be debugged.

Demo model: Huawei nova5 pro && iphone12 system version:

How to enter engineering mode on Huawei mobile phone, the specific steps are as follows:

1.On your phone's desktop, tap **.

2.Enter *

3.You can enter the project menu, and each option will have submenus, which can be set according to your needs.

How to enter the engineering mode of the Apple mobile phone, the specific steps are as follows:

The iPhone project mode is the Field Test mode.

1.On your phone's desktop, tap **.

2.Tap the keypad.

3.Enter *3001

4.Then click the green button to enter the engineering mode.

There are many system setups involved in engineering mode. Please do not change it if you do not understand it.

Summary: How to enter the engineering mode of Huawei mobile phone is to turn on dialing, enter * * to enter.

How to enter the engineering mode of the Apple mobile phone is to click **, dial and enter *3001*, and then click the green button to enter.

Take the OPPO R9S mobile phone as an example, the opening method is as follows:

First, click "Settings" on the desktop of the OPPO R9S phone.

Second, then select the "About Phone" option.

3. Click the version number 7 times in a row after entering.

Fourth, then go back to Settings and select other setting options.

5. After entering, click on the developer option (engineering mode), and the developer option is the engineering mode.