[ZTE Axon 7 Questions & Answers] Yansin:
Solution found!

I’ve already found the solution for the manual upadate from SD card and it’s easy to do. :)

Theses instructions are not mine and I’m not responsible of what you do with your phone. I found them inside the update file that I Downloaded then I unzipped.

You will find a PDF document called “ZTE A2017G Upgrade Guide (through an SD Card).pdf”. You can use it to do the upgrade step by step.

Till now, all was OKEY: backup is very quickly with Zte app. The update take about 5 minutes, than the phone restarts automatically.

If you cannot find the B08 update file, try to download it from here: http://www.ztedevice.com/support/detail?id=98CEB24F9FFD433EA99EC424163149A6

Here are the steps (exactly as mentioned in ZTE Upgrade Guide)

ZTE V7 Upgrade Guide (Through an SD Card)

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1. Backing Up the Data

1) Download the upgrade package.

Open http://www.ztedevice.com.cn/support and download the upgrade package (update.zip) that matches your phone model. If the downloaded package is not update.zip, unzip the package to obtain update.zip.

Ensure that your micro SD card is at least 3GB.

2) Remove the SIM card before the upgrade. Back up the data and APPs in your phone by using the built-in Backup function. To enable the built-in Backup function of your phone (an SD card must be inserted), select

Backup and Restore from the main menu。

3) Perform data backup.

Note:

You should not remove the SD card during the backup process. To avoid data lost, it is not recommended to cancel the backup process.

4) Verify that the update.zip file in the root directory of the SD card

matches the model of the phone. Do not modify the file name and extension name of the files in the upgrade package.

5) Verify that your phone has enough (at least 30%) power. Charge the phone if required. To avoid data lost or upgrade failure, it is not recommended to upgrade your phone through an SD card when the phone is being charged.

Note:

You should not perform any other operation on the phone during the upgrade process. To avoid upgrade failure, do not forcibly remove the battery.

A normal upgrade should be completed in 2-3 minutes. If the phone does not reboot or show any response in three minutes, you should perform the upgrade process again. If the phone cannot be started, perform a forced upgrade. If the forced upgrade does not work, you should contact an after-sale service agent for support.

2. Upgrade Description

There are two upgrade methods: normal upgrade and forced upgrade.

If the phone cannot be started properly, for example, the phone cannot be started, or the phone does not enter stand-by state, perform a forced upgrade. If the phone can be started properly and the Settings menu can be selected, perform a normal upgrade.

3. Upgrade Steps

A. Normal upgrade (the primary upgrade method)

1) Download the upgrade package that matches the phone model from ZTE official website (http://www.ztedevice.com.cn/support/), extract update.zip from the package, and copy update.zip to the root directory of the SD card (the file name must be update.zip

2) Select System Manager > File Manager> SD Card from the main menu, and verify that the update.zip file in the root directory of the SD card is proper.

3) Tap the main screen is displayed. Tap and select SETTINGS >All setting > Updates>,

4) Click INSTALL, The phone automatically powers off and reboots. the SD

card upgrade screen is displayed,

After the phone is upgraded, it is rebooted again. After the phone starts properly, it is recommended to manually restore the phone to its original factory default settings. The phone is upgraded properly and can be used.

B. Forced upgrade (for the phones that cannot be started or the phones that cannot enter standby state)

1) For a powered-off phone, press and hold both the volume key + and power

key to enter into Recovery mode.

2) Press the volume key - to select apply update from sdcard, and press the power key to confirm it.

3) Press the volume key - to select the update.zip file, and press the power key to confirm it. The phone completes the upgrade process in about three minutes.

4) On the Upgrade Complete screen, select reboot system now and press the power key to confirm it.

4. (Optional) Restoring the Data

If you have backed up data before upgrading your phone, restore the data.

1) Backup and Restore important user information.

2) Perform data restoration.

Note:

Do not remove the SD card during the restoration process. To avoid data lost, it is not recommended to cancel the restoration process.

An interesting thread: http://xdaforums.com/axon-7/how-to/manual-updating-a2017g-t3519104 !