Hello,
I follow up this documentation https://developer.nordicsemi.com/nRF_Connect_SDK/doc/1.9.1/nrf/ug_thingy91_gsg.html#updating-firmware-through-external-debug-probe to update my device.
Before I update my device with the last version I could see on my Thingy91 the two devices to install firmware. I can only see the first MCU and not nrf9160.
I follow up this 
Update the modem firmware on the nRF9160 System in Package (SiP):
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Switch off the Thingy:91.
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Press SW3 while switching SW1 to the ON position.
But no way I don't see no devices in the list with the programmer. I check on my device list /dev I work with osx and nothing too.... so sad. No idea ? could it be hardware broken ? but before the update with this file (thingy91_nrf52_connectivity_bridge_2022-02-17_ec486dab.hex) it was working perfectly ....
My device in normal swicth on is working perfectly I received messages on the nrfCloud ....
