UNABLE TO GENERATE PRIVATE KEY

Question

Hi, 
 I am following a tutorial in order to learn the procedure for DFU OTA . I installed the nrfutil but still unable to generate the private key. 
 I have tried several commands like : 
 nrfutil.exe keys generate private.key nrfutil.exe keys generate priv.pem but it did not work I think i am using the latest version . 5.0.0 I am getting such errors : TypeError: write() argument must be str, not bytes NameError: name 'raw_input' is not defined Please suggest. Could I be in wrong directory while writing these commands ? C:\Users\ArshdeepMalik>nrfutil.exe keys generate private.key Thanks much!

AndreasF · Accepted Answer

Hi. 
 Sorry for the confusion, I will try to make things a bit clearer. 
 nrfjprog is a part of the nRF5x Command Line Tools and you can find a user guide here . The installation is described here . And a command reference list is described here . When you have installed the Command Line Tools, you can open a cmd window and type "nrfjprog.exe -e". This will erase available code and UICR flash areas and reset the device, like this:

The bootloader question: 
 Can we start from scratch, where you follow this procedure: 
 Step 1. 
 Generate a private key by running this command in cmd in your SDK 15 folder: 
 nrfutil keys generate priv.pem 
 Step 2. 
 Generate a public key file from that private key by running this command in cmd in your SDK 15 folder: 
 nrfutil keys display --key pk --format code priv.pem --out_file dfu_public_key.c 
 You should now have a file named dfu_public_key.c in your SDK 15 folder. 
 Step 3. 
 Open the folder nRF5_SDK_15.0.0_a53641a\examples\dfu 
 You see that there is a file named dfu_public_key.c , delete this file. 
 Take the file you generated in step 2 and move it to this folder. 
 Step 4. 
 Open up the SES project in the folder nRF5_SDK_15.0.0_a53641a\examples\dfu\secure_bootloader\pca10056_ble\ses and build it. 
 After you have built it the folders: \Output\Release\Exe will appear in the folder structure. Open these folders and copy the file named secure_bootloader_ble_s140_pca10056.hex to your SDK 15 folder. This is the .hex file for the secure bootloader you have created. 
 Step 5. 
 Open the folder nRF5_SDK_15.0.0_a53641a\components\softdevice\s140\hex, and copy the .hex file s140_nrf52_6.0.0_softdevice.hex to your SDK 15 folder. 
 Step 6. 
 Create an application, for example the ble_app_bms example, and copy the .hex file as you did for the bootloader to your SDK 15 folder (you find the .hex file in nRF5_SDK_15.0.0_a53641a\examples\ble_peripheral\ble_app_bms\pca10056\s140\ses\Output\Release\Exe, named ble_app_bms_pca10056_s140.hex ) 
 Step 7. 
 Generate a bootloader settings page by running this command in cmd in your SDK 15 folder: 
 nrfutil settings generate --family NRF52840 --application ble_app_bms_pca10056_s140.hex --application-version 3 --bootloader-version 2 --bl-settings-version 1 settings.hex 
 The output looks like this: 
 
 Step 8. 
 Merge the settings.hex and secure_bootloader_ble_s140_pca10056.hex together by running this command in cmd in your SDK 15 folder: 
 mergehex.exe --merge settings.hex secure_bootloader_ble_s140_pca10056.hex --output my_bootloader.hex 
 The output looks like this: 
 
 Step 9. 
 Generate the DFU packet by running this command in cmd in your SDK 15 folder: 
 nrfutil pkg generate --hw-version 52 --application-version 3 --application ble_app_bms_pca10056_s140.hex --sd-req 0xA9 --key-file priv.pem app_dfu_package.zip 
 The output looks like this: 
 
 Step 10 . 
 You should now have these files in the SDK 15 folder: 
 
 app_dfu_package.zip 
 ble_app_bms_pca10056_s140.hex 
 my_bootloader.hex 
 priv.pem 
 s140_nrf52_6.0.0_softdevice.hex 
 secure_bootloader_ble_s140_pca10056.hex 
 settings.hex 
 Step 11. 
 Open the SDK 15 folder in cmd , and write the commands: 
 nrfjprog.exe -e 
 nrfjprog.exe --program s140_nrf52_6.0.0_softdevice.hex --verify 
 nrfjprog.exe --program my_bootloader.hex --verify -r 
 The output looks like this: 
 
 You have now programmed the SoftDevice and the Bootloader including the bootloader settings page. 
 Step 12. 
 Open nRF Connect on your mobile phone and scan: 
 
 When you find DfuTarg click on Connect . 
 
 And click on the DFU button and Select distribution packet (ZIP) 
 
 And select the file app_dfu_package.zip . 
 After you have finished the device will reset and start advertising as Nordic_BMS 
 
 Does this make things a bit clearer? 
 Best regards, 
 Andreas

AndreasF · Answer

Hi. 
 Could you create a new ticket for this issue? 
 Since this question is not the same as the one asked in the start of this ticket, and it will be hard for other community members to find it when they are searching. 
 Best regards, 
 Andreas

UNABLE TO GENERATE PRIVATE KEY

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