Trying to update modem SW on a brand new Thingy 91 board. MCUboot DFU failed. Please make sure that the device is in MCUboot mode and try again. None of answered questions fixed issue.

[Jimbrookline]

Windows 10 USB link. NRF connect 3.6. Followed recommended instruction on extracting firmware. Pressed switch 3 in middle of board on power up. Device showed up in window. Clicked enable MCU boot.  Got error: MCUboot DFU failed. Please make sure that the device is in MCUboot mode and try again.    You can see the file version I was trying to load below.   Sorry, I can't tell what serial number the board is. But it says: PCA20035   1.4.0   2020.22  I noted that several people have posted about this, but did not see any solutions in the threads.   I do not have a segger debugger.

Thanks

Jim

20:26:17.108

Modem DFU starts to write...

20:26:17.108

Writing C:\Users\jimdo\OneDrive\Nordic\thingy91_fw_2020-10-30_5522ca2b (1)\mfwnrf9160122.zip to device

20:26:29.566

MCUboot DFU failed. Please make sure that the device is in MCUboot mode and try again.

[Jimbrookline]

Failed with same error "Make sure device is in MCU Boot Mode"  Just to be sure I did this right.   I powered up device, pushing small button"  I loaded connectivity bridge into File section in Hex format.  MCU Boot checkbox on. and hit Write.

Onto try mcumgr.  Just a question.  I have a Win10 machine, do not have linux loaded.   If I follow the instructions in the guide will that run as a VM on the Win10 machine?