RE: Install bootloader from dfu .zip-file on empty/erased nRF52

bjorn-spockeli — Wed, 19 Feb 2020 11:59:06 GMT

Hi Johannes,

if you have the zip that only contains the bootloader, then you can use Jlink Commander and the loadbin command to load the ebootloader.bin as long as you know its start address.

loadbin Load *.bin file into target memory. Syntax: loadbin <filename>, <addr>

The manifest file indicates that this is a zip package generated using a old version of nrfutil and is compatible with our legacy DFU solution, i.e. SDK v11 and backwards. The older bootloaders were by default placed at 0x7A000 and took up 16kB( 4 flash pages)

You also need to write the bootloader start address to UICR, specifically 0x10001014. E.g. if the bootloader starts at 0x7A000 then this is the value that should be written to 0x10001014. You can do this using nrfjprog and the --memwr command.

Best regards

Bjørn