Well I am an old HOB devotee, so I FOLLOW instructions as you have always advised.
I ran .jar file, extracted the update to a folder and then clicked on the Keep Data option in the panel.
The handset was in AP FASTBOOT mode and connected per instructions to the computer. It's a Droid RAZR Maxx of unknown pedigree with 4.1.2 running, rooted and some bloat frozen.
SWDL.txt file follows:
>>>07/19/14 16:10:23 New Log Started For Software Download.
07/19/14 16:10:23 The FlashLog key is turned off.
07/19/14 16:10:26 00001060 Phone.cpp 518 0 ERROR Generic failure when sending command.
07/19/14 16:10:26 00001060 Phone.cpp 1754 0 ERROR GetTechnology failed: ERROR.
07/19/14 16:10:26 00001060 Phone.cpp 518 0 ERROR Generic failure when sending command.
07/19/14 16:10:26 00001060 Phone.cpp 1754 0 ERROR GetTechnology failed: ERROR.
07/19/14 16:10:26 00001060 Phone.cpp 518 0 ERROR Generic failure when sending command.
07/19/14 16:10:26 00001060 Phone.cpp 1754 0 ERROR GetTechnology failed: ERROR.
07/19/14 16:10:26 00001060 Phone.cpp 518 0 ERROR Generic failure when sending command.
07/19/14 16:10:26 00001060 Phone.cpp 1823 0 ERROR GetSoftwareVersion failed: SendTC failed: ERROR.
07/19/14 16:10:26 00001060 Phone.cpp 518 0 ERROR Generic failure when sending command.
07/19/14 16:10:26 00001060 Phone.cpp 1981 0 ERROR GetSoftwareFlexVersion failed: ReadSeemElement failed: ERROR.
07/19/14 16:10:26 00001060 Phone.cpp 518 0 ERROR Generic failure when sending command.
07/19/14 16:10:26 00001060 Phone.cpp 1951 0 ERROR GetBootVerFlashMode failed: SendTC failed: ERROR.
07/19/14 16:10:26 00001060 Phone.cpp 518 0 ERROR Generic failure when sending command.
07/19/14 16:10:26 00001060 Phone.cpp 1870 0 ERROR GetDRMVersion failed: SendTC failed: ERROR.
07/19/14 16:10:26 Multi upgrade started for 1 phones
07/19/14 16:10:26 [Device ID: 0] 1/11 flash partition "gpt.bin"
07/19/14 16:10:26 ERROR: 1/11 flash partition "gpt.bin" -> Phone returned FAIL. - on device ID 0.
07/19/14 16:10:26 [Device ID: 0] 1/11 flash partition "gpt.bin" -> Phone returned FAIL.
07/19/14 16:10:26 ERROR: Failed flashing process. - on device ID 0.
07/19/14 16:10:27 Multi upgrade finished.
<<<
Thanks,
RMD