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Upgrade failed by using the nRF Connect tool

By using the DFU to transfer an updated version of the application, The nRF Connect tool pop-up tip:"upgrade succesfully". But the version of application mostly is still older.

Sometime it's OK.


Mobile phone models:  Meizu M3s, Meizu note2
The android 5.1 system
nRF Connect tool: Version 4.12 and above

I had tried to change the value:  nRF Connect tool->settings->dfu options->number of packets: from 10 to 1.  It doesn't work.
Everytime it will upgrade succesfully by using the samsung,huawei, or google mobile phone.

What could I do that can match all kind of android mobile phone?

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According to the reply, add the following content:

The device is nrf52x

The SDK is nRF5_SDK_11.0.0_89a8197

The DFU(library version1.6.1) in NRF Toolbox has the same problem.

There is no problem during the upgrade process. I had checked the log.txt.

 

Thank you.

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