The DFU failed when DFU to 99%.

[Milk]

I use SDK9.0,SD8.0,the device is 51822AC,the device can enter to Bootloader mode. As it shows below. Then I selected the .zip file to start DFU But when it reached to 99%,the sequence happened. The system still run the old code. So I check the code,found the file bootloader.c,the variable m_update_status equals to BOOTLOADER_RESET. I searched the project,found only the function void dfu_reset(void) lead to this situation.Finally,the dfu_reset() was called in line about 608 of file dfu_transport_ble.c. My questions is why this situation happened,how can I find the reason quickly?Thank you very much.

[bjorn-spockeli]

How do you know that its the old bootloader that is running and not the new one? I would check the return code of dfu_image_validate() in dfu_transport_ble.c. In this function dfu_init_postvalidate() is called and the bootloader will not be updated if this returns an error.