Update Bootloader via FOTA

[Chris Yin]

Hello,

We are developing products with nRF52810 MCU. There are only 100 bytes ROM left now. We hope to update bootloader via Buttonless DFU in single bank way.  Is it available given ROM is not so sufficient ?

Many Thanks,

Chris

[Vidar Berg]

Hello,

It's not possible to update the bootloader "in-place", so  the update has to be dual-banked. This means the old bootloader has to delete the application to make room for the new bootloader image. But note that you can re-upload the application again as soon as you've completed the bootloader update.

Best regards,

Vidar

[Chris Yin]

So is the answer 'yes' even if rom is not abundant in our case?   The bootloader needs to delete application then new bootloader and soft-device can be updated via BLE.  Application is re-updated after bootloader update completes.  Is it correct?

[Vidar Berg]

Yes, correct. The bootloader can be updated, it's just that the update has to be performed in two steps instead of one due to the limited flash space.

[Chris Yin]

This is resolved and thank you, Vidar.