UPDATE: I got the same result using: https://downloads.sierrawireless.com/mangOH/exe/yellow_wp77xx_0.5.0-octave.exe
Log of radio state below, output of the .exe file at the end.
root@swi-mdm9x28-wp:~# cm radio
Power: ON
Current Network Operator:
Current RAT: Module not registered on network, RAT not available
Status: Not registered and not currently searching for new operator (LE_MRC_REG_NONE)
Signal: No signal strength (0)
PS: Packet Switched Not registered (LE_MRC_REG_NONE)
root@swi-mdm9x28-wp:~# cm radio
Power: ON
Current Network Operator: Sierra Wireless
Current RAT: Module not registered on network, RAT not available
Status: Not registered but currently searching for a new operator (LE_MRC_REG_SEARCHING)
Signal: Very strong signal strength (5)
PS: Packet Switched Not registered (LE_MRC_REG_NONE)
root@swi-mdm9x28-wp:~# cm radio
Power: ON
Current Network Operator: Sierra Wireless
Current RAT: Module not registered on network, RAT not available
Status: Registration was denied, usually because of invalid access credentials (LE_MRC_REG_DENIED)
Signal: Strong signal strength (4)
PS: Packet Switched Not registered (LE_MRC_REG_NONE)
Output of yellow_wp77xx_0.5.0-octave.exe
FDT version: 1.0.1902.1
Awaiting adapter …
Setting images preference …
Resetting …
Awaiting download port …
Switching to streaming mode …
Downloading images …
Writing image /
Flashing image \
Awaiting adapter …
Checking update status …
Enabling selective suspend …
Firmware image download succeeded.
Final Firmware update succeeded.
Preexisting images information:
Current:
Firmware:
ImageId: 001.027_000
BuildId: 02.32.02.00_SIERRA
Configuration:
ImageId: 001.027_000
BuildId: 02.32.02.00_SIERRA
Final images information:
Current:
Firmware:
ImageId: 001.027_000
BuildId: 02.32.02.00_SIERRA
Configuration:
ImageId: 001.027_000
BuildId: 02.32.02.00_SIERRA
OEM PRI: 9909138 001.001
IMEI: 352653090210394
Total time elapsed: 125266 ms.
Time to switch to boot mode: 31516 ms.
Images downloaded:
Image ID: 001.027_000
Build ID: 02.32.02.00_SIERRA
write time: 22297 ms
additional flash time: 23063 ms
Time to reset to application mode: 44766 ms.
Press Enter to continue …