currently I can build Yocto from source and upgrade device
for Sierra there are two update tools , swiflash which is for upgrading via USB (bricked device state) and fwupdate which is the standard tool to be used when system is active
using fwupdate works great, however swiflash works terrible.
I can get swiflash to work, but every time it takes many, many attempts
using mangoH red, setting sw 7 to “on”, I on PC I see created /dev/ttyUSB0 (this is created only when setting sw7 on as expected)
but trying to update issues:
$ sudo swiflash -m “WP76XX” -i build_bin/tmp/deploy/images/swi-mdm9x2
Detecting USB of the target
No device connected
this is extremely frustrating, can you assist?
am am working on ubuntu 16.04, “real” PC not VM. even restarting the PC does not always help. I have installed swiflash via apt-get and I do have the current rules set