Help, there is no signal after flashing

If there is no signal on your phone or an emergency call prompt is displayed on the screen, it is recommended:

2.If it is a dual-SIM phone, please check whether the SIM card is activated: Settings - SIM Manager - SIM1 SIM2 - Click the SIM card icon - slide to turn on (the operation mode may be slightly different for different models of mobile phones).

3.If there is still no signal, it is recommended to turn off the SIM card and remove it, wipe the SIM card chip with an eraser, and then reinstall it.

4.If it doesn't work, try to change to another location to rule out whether it is caused by poor signal coverage in your location.

5.Try to change the network mode to 3G or 2G (do not select the auto-connect mode). Note: Some machines do not support changing the network mode.

6.Try to change another SIM card.

7.Update your phone's system version: Settings - About Phone (About Device) - Manual Update Automatic Update (Software Update System Update - Update). Note: Please back up the data (contacts, messages, **, etc.) in your device before upgrading.

If there is still no signal or emergency call is displayed after the above operations, please bring the purchase invoice, warranty card and machine to the nearest service center for inspection.

1. There is no signal or the signal is relatively poor, mainly because the signal will be affected by various factors such as terrain, landform, and high-rise buildings in the process of propagation, such as the current location is in a relatively closed place, and the signal may be affected.

2. If the mobile phone signal of other China Unicom users is normal, the following methods can be used to troubleshoot:

Method 1] Turn on airplane mode, then turn off or restart your phone and try again.

Method 2] Test of changing the phone card to change the mobile phone card to the mobile phone of a family member or friend and try again.

Feedback, we will check and deal with it as soon as possible.

It is recommended to check it by clicking on the following methods:

Whether the SIM card is inserted correctly.

Whether the wrong SIM card is inserted, such as the standard version inserts the telecom SIM card, etc.

Try to replace a different SIM card, if the status is still unknown during hardware testing, it is recommended to go to the repair point for testing; If the detection status is normal, it is recommended to go to the carrier to replace a SIM card (the SIM card may be aging).

Whether the network type is correct and whether the carrier selects Automatic. (China Unicom selects 3G priority, mobile selects only 2G, and China Telecom selects automatic).

Whether there is no signal in the area. You need to check whether other mobile phones on the same network have signals.

You see if there is a baseband version, if the baseband version is unknown, then please card or line brush the official flash package, the card brush is invalid on the line brush.

Double clear first, not re-flashing.

Problems with the baseband version Change a baseband from the brush.

Samsung's? What is the specific model.

Hello, I repair the mobile phone, flashing the phone to cause the mobile phone signal, specifically to check, you first compare it with other mobile phones, in the same place other mobile phones are good, your mobile phone is not good on the network, there are many problems with the mobile phone motherboard will cause the signal to be unstable, software problems will also cause signal diving, according to the situation you said, I suspect that your information is written wrong, re-flash, upgrade team thank you for adopting.

The version of your program is too high, and you need to check if there is any problem with the sticker!

1. If there is no signal or the signal is poor when the mobile phone is inserted into the Unicom card, it may be due to other objective conditions. Because the signal will be affected by various factors such as topography, landform, and tall buildings during propagation, if you are in a relatively closed place, the signal will be affected. Here's how to deal with it:

Turn the phone back on and off and try again;

Swap the SIM card to a family member's or friend's phone and try again;

Check whether the signals of other Unicom users around you are normal.

2. If it still cannot be used normally after self-service troubleshooting, it is recommended that you contact the local manual customer service for verification and processing.

1.Damage to the SIM card leads to no service due to inability to read the SIM card, 2The hardware failure of the mobile phone leads to the inability to read the SIM card resulting in no service, 3

Software conflict resulting in inability to read the SIM card resulting in no service, 4There is no signal coverage in the area, resulting in no service.

5.It is recommended to bring the device to a regular after-sales center for repair, so as to avoid problems such as damage to the motherboard caused by damage to the mobile phone card slot.

This,It's very simple,Yes, set it up directly,Mobile network,Access point name,Then click the menu key,Reset to the default settings,Wait, wait, wait,,, it's good, and if it's not good, flash the official firmware! (Actually, you can brush one casually, as long as the bag is fine,)

It should be that the baseband brush is broken.

Baseband: Baseband is a special piece of mobile phone, or it can be understood as a BIOS responsible for communication, responsible for completing the demodulation, descrambling, despreading and decoding of wireless signals in the mobile network. Different baseband signal strength is different, and generally brushing wrong or bad brushing will lead to no network and no signal on the mobile phone.

Solution: Re-flash a ROM package with a different baseband of the same model.

Simply find the original baseband of the model or a better baseband and brush it in.

Card swiping method: turn off the mobile phone, and press and hold the plus button + power button of the volume at the same time Volume plus key + home button + power button Don't let go, release the button after the screen lights up, at this time the phone will enter an all-English interface, referred to as recovery mode.

Use the volume up and down keys to select the first one: wipe data factory reset (wipe data, factory reset) press the power button or home button to confirm the selection, and find the yes option to confirm. Then select wipe cache partition (clear the user's data cache and the software's cache), and also select yes

Brushing the baseband does not require these 2 operations).

After performing the above operations, all third-party software installed on the phone will be erased, and the data will also be erased. Then select Install Zip from SDCARD, confirm your selection, and the flash will start automatically. (Brushing the baseband can directly skip the 3 steps here).

Pay attention to the flashing process do not do any operation on the phone, before flashing the phone to keep the power sufficient, at least over 50%, it is best to be full, to prevent the flashing process from happening accidentally. After the flash, it will return to the recovery interface, select the first reboot system now (restart the phone), at this time, the flashing is over, enter the phone settings - about the phone - software version --- view the baseband information.

1. In order to understand and solve the abnormal problems after flashing the mobile phone, it is recommended to send the mobile phone to the nearest service center for testing, and the service center will determine the specific problems of the mobile phone according to the test results and further processing.

2. Due to the risk of flashing, the official website does not provide flashing software, and it is recommended not to flash the machine by yourself. If there is a problem after flashing, do not operate it by yourself to avoid the problem from expanding.

First, there are two reasons for the poor network signal and no service, the operator problem and the user's own setting problem, but due to the SIM card, it is temporarily impossible to pass the test of its own replacement.

Second, if it is due to your own settings, it is recommended to restore the network settings.

Third, if it is a problem with the operator, it is recommended to call**operator customer service**: China Unicom 10010, China Mobile 10086 Telecom's customer service** are all 10000, feedback, ask the relevant departments to verify whether it is a local network problem, and go to the business hall to test the SIM card.

Fourth, if the reason for the operator is ruled out, then it is a problem with the mobile phone, and it is recommended to contact the iPhone after-sales service in time to negotiate and solve it.

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