Recover bootloader on pca10059 - invalid hex file ?

Question

I recently bought a pca10059 and inadvertently erased the bootloader while using a script from another project.. (it did --recover unfortunately). 
 I'm using the debug out port on a pca10056 for swdio/swdclk; I have 3v0 to VDD_OUT and 'nrfjprog --deviceversion' reports 'NRF52840_xxAA_REV3'. I have SB47 shorted as well so I know I'm talking to my pca10059. 
 I've tried flashing various items including the prebuilt graviton_bootloader_mbr_v1.0.1-[nRF5_SDK_15.0.1-1.alpha_f76d012].hex linked to in this page: nRF52840 Dongle Programming Tutorial 
 However, I get this error: 
 $ nrfjprog -f nrf52 --program graviton_bootloader_mbr_v1.0.1-[nRF5_SDK_15.0.1-1.alpha_f76d012].hex --sectorerase --log
Parsing image file.
ERROR: The file specified is not a valid hex file, has data outside valid areas
ERROR: or does not have data in valid areas. 
 I also built examples/dfu/open_bootloader for pca10059 and when I try flashing that I get the same error. 
 $ nrfjprog -f nrf52 --program ./pca10059_usb/armgcc/_build/nrf52840_xxaa.hex
Parsing image file.
ERROR: The file specified is not a valid hex file, has data outside valid areas
ERROR: or does not have data in valid areas. 
 I've done a fair amount of work on other nrf52840_xxAA devices and am familiar with the tools and workflows; I've just never had this particular problem. 
 I'm missing something. Thoughts?

hpeyerl · Answer

Never fails. Fight with something for 2 days, finally post the question, then an hour later figure it out.

The key was the NRF52840_xxAA_REV3 vs my other boards are NRF52840_xxAA_REV2.

The solution is to install a new nrfjprog. I had 10.12.1. I installed 10.18.1 and all is well.