Bootloader programming issue The flash is not erased

[ting²]

Hi everyone, I am using the nRF51822, I have an issue of programming the bootloader. It is said that the flash is not erased. But I just did an erase all before programming. Is there anyone who encountered the same issue? Thanks!

[Keton]

I'm having the same issue on one of my Rigado BMD300 based boards. It came preprogrammed with bootloader and demo code which ran ok. After erasing nothing can be programmed into it despite multiple erase all and recover commands that run without error. Other chips from the same batch program just fine so this may be a faulty chip.