nrf51822 can not used to cellphone to "DFU" download the XXX.zip. The public_key is good and the code in SDK is not changed.

[Martinchen]

i am using  the flash 256K and ram 32k of  NRF51822. the examples of SDK12.1.0 is  includes  dfu/bootloader_secure and ble_peripheral/ble_app_uart. when i was used in the software of nrfgo studio  to download the two examples, I can not used the "DFU" to download the XXX.zip. please tell me this is why i can not used "DFU" in cellphone  to  download XXX.zip, I am not changed SDK.

[Amanda Hsieh]

Hi, 

I would recommend taking a look at this tutorial.

-Amanda H.