Secure DFU bootloader doesn`t work

[thwroll]

Hello!
I`m developing custom board with NRF52832-QFAA on board and need to use serial bootloader. As in example (secure_dfu_ble_s132_pca10040), I`ve implemented it on board: changed buttons and LEDs pinout. I have no CTS and RTS lines on board, so I need to use no flow control. Baud rate is set to 38400. Baudrate decrease to 9600 had the same result.

As membered in instruction(https://devzone.nordicsemi.com/nordic/short-range-guides/b/software-development-kit/posts/getting-started-with-nordics-secure-dfu-bootloader#h142sjziaykttwu31ly1toq0p4zzp8vq) I build firmware image succesfully. But I can`t download firmware using nRFgo Studio or nrfutil.

I tried to sniff UART line and as I understood it`s all right with acknowledgement. Can u please help me?

Device enters DFU mode (LED lights ON).

[Einar Thorsrud]

Hi,

nRFgo Studio is not recommended for use with nRF52 devices any more and have not been updated for quite some time, so please use nrfutil.

Can you test with a debug bootloader project (suffixed _debug) which use RTT logging? If you upload the RTT log here as well as the log from nrfutil that should hopefully give some insights.

Which example project do you use (I assume it is not secure_dfu_ble_s132_pca10040 as that use BLE for transport and not UART) and from which SDK version? Which changes have you made? Please share all changes, including the UART configuration and any other changes.