Recover the MBR

[mamrezo]

hello i have nRF51822 QFAAH1 and accidentally erased the chip and also MBR section with jlink, what should i do for bring MBR back.

[endnode]

Take lower 3 or 4kB (depending on version you have, see Soft Device release notes) of SD HEX file and flash it to the chip (if it is read/write protected then you are indeed out of luck and you need to erase entire NVM first).

[bjorn-spockeli]

Hi Mamrezo,

the MBR is a part of ourSoftDevices, see this page on Infocenter, thus you just have to flash the SoftDevice to your nRF51822.

Best regards

Bjørn

[mamrezo]

thanks for you reply, first time i flashed SD to my chip and uploaded my program, it worked, but when accidentally erased all the chip and reflashed the SD, the program didn't work.

[bjorn-spockeli]

Are you sure that the SoftDevice you flashed to the nRF51822 is compatible with the application program? Which SDK version is the application built in and which SoftDevice version are you using?

[mamrezo]

in this time i am using Arduino and SD s130_nrf51_1.0.0_softdevice.hex my chip part no. is (N51822 QFAAH1 1621DR)