Latest status of Buttonless secure DFU in SDK 13.0

[sam wagner]

Hi,

I just got the email about SDK13.0 official release. The list of changes in this release include "Secure DFU improvements". What does it mean? Is Buttonless Secure DFU completely supported in this release?

Regards, Sam

[Hung Bui]

Hi Sam,

Compare to SDK v13 alpha, the buttonless example in the SDK v13 official doesn't change much.

• It is still in experimental mode

• Some issues on SDK v12 and 13 alpha were fixed such as the characteristic's write property missing, the bootloader_setting section missing were fixed.

• Now we use RAM retention register GPREGRET to set the flag to enter bootloader mode instead of writing to flash.

• Change the service's UUID to the Secure-DFU UUID

• Change from the DFU control point property from notification to indication

• Requires nRFutil v2.2.0

[Srikar]

@Hung Bui,Means Bootloader IROM starting address 0x78000 and size 0x6000 is same in SDK 13.0 and 12.0.2. In my case DFU update (secure BL+SD+APP) from 12.02 to 13.0 is failing even other private keys are same but DFU updates are working for without issues from 12.0.2 to 12.0.2 and 13.0 to 13.0 .