Problems with mobile phone system updates and software installations.

For system updates, please go to the Samsung after-sales customer service center? Can't update your phone on its own?

If the phone comes with an update prompt, please keep the battery sufficient and wait for the update to complete2If it's flashing, it may take some time, but it's better to consult the ROM package author specifically3If it is a reboot update, you can unplug the battery and restart it.

It is recommended to follow these steps:

Whether you have Mobile Security Guard software or third-party software programs installed on your phone, and if so, try to uninstall it.

2.It is recommended to factory reset the machine, operation steps: Settings - Reset Privacy Private - Factory Reset.

3.A firmware upgrade attempt is recommended. (Steps: Settings - About Device - System Update) 4If the problem persists after trying the above methods, bring the purchase invoice, repair card and machine to the service center, and the engineer will check the machine and deal with it.

Wait for the installation to complete, it will take a little longer to boot after completion, be patient.

Wait until it's installed. Don't pull out the battery.

Wait for the update to finish.

If it is called in such a state for a long time, that is, suspended animation, it can only be restarted and brushed with a thread again. If it doesn't work, you can only wait for the power to run out.

When upgrading the software on Android phones, the installation always fails, and the reason is that the phone has already installed this app, because the allow external** app installation feature is not turned on the phone.

The steps to resolve the problem are as follows:

1. Take Huawei P20 as an example, first tap the icon on your phone to open the Settings app.

2. Then click on the "Advanced Settings" option on this page.

3. Then click on the "Security" option on this page.

4. Then click the switch behind the "External** App Installation" below this page to turn it on, and then you can install the app normally.

It's good to delete the original software and then download it,

It may be that the phone has set up installation permissions!

It is recommended to restart the phone, which may be caused by too much junk in the Android phone system.

It may be that there is not enough memory after the system upgrade.

This is caused by the incompatibility of the newer version of the software and the system, and can be resolved by downgrading:

1.Go to the official website to find the ROM you need.

Swipe the phone: power off (more than 50% battery) - press and hold the volume up button, menu button, and power button at the same time, and press the volume down button after the interface appears.

2.The first thing after entering the recovery mode is to perform the double wipe first, and perform the following operations, (in the recovery mode, press the volume up and down keys to select, and press the home button to confirm).

3.Select first.

WipeData Factory Reset - Select Yes - Select Delete All User Data to confirm.

4.Then select WipeCache Partition - select Yes --- Wipe Cache to confirm.

5.Then press the volume to select InstallZip from SDCARD, and then select Choose in the screen that appears

Zip from SDCARD, then find the ZIP format flash package that you just put in the root directory of the SD card, then press the home button to confirm, and then select yes.

6.Start flashing, return to the main interface of recovery after flashing, and select Reboot System

now, confirm and start the reboot.

7.The card swiping is over, and the boot and downgrade is completed.

The installation was unsuccessful, the main thing is not the root problem, it's that you streamlined the pre-installed program, my nexus is also rooted, but it's a pure version, I didn't delete any programs, the same from the upgrade to. You can also try to unroot and upgrade again, but it won't work out.

Answer, support me.

Secondly, the application is not installed when installing the software or an error is prompted when parsing the package

2. There is a problem with the electronic signature of the application installation package, which means that the installer has been tampered with.

Hi Mi 2 series.

c.When everything is ready, please follow the brushing tutorial on the official website to use the sixth type of line brush, which is the official flashing tutorial:

The app is not installed and is not compatible with your phone, probably your ROM problem.

Problems with mobile phones, I've had them before, just flash the phone.