Can't put Thingy91 into recovery mode / USB not recognized

Question

Just got the Thingy91, While following the first start guide I must have done something wrong because the SW3 no longer puts the nrf9160 into recovery mode / It's not recognized by my pc any longer. 
 (tried on multiple Machines and OSs). What do? 
 (I can still use the SW4 to put the nrf52 into recovery mode). 
 Nothing in Device manager on Win. 
 Nothing in lsusb on linux. 
 I did manage to connect it to nrfcloud before it went rogue. 
 I don't currently have access to a SWD programmer 
 any help would be greatly appreciated.

Didrik Rokhaug · Accepted Answer

Pretty much, yes. 
 The nRF9160 does not support USB, so the Thingy:91 uses the nRF52840 to provide USB support. Therefore, if you program the nRF52840 with an application that does not support USB, you will not be able to interface with the nRF9160 that way. 
 However, you will still have access to the debug port of the nRF9160, so if you have an external programmer (such as an nRF9160 or nRF5340 DK), you can still program the nRF9160. In addtition, you can use the debug port to set up an RTT connection, so it is still possible to get logs from the 91. 
 You might also be able to connect to vairous test points etc, and be able to use that as a way of communicating with the nRF91, but you will have to check the hardware files of the Thingy to see if that is possible.

bmo · Answer

Was able to resolve this by flashing nrf52 with mcumgr. nrf91 is now back up.

mcumgr --conntype=serial --connstring=/dev/ttyACM0 image upload thingy91_nrf52_connectivity_bridge_dfu_2020-09-23_b6ad40d0.bin

Hello,

I think I'm facing this exact issue. Glad to see you successfully got the nrf91 working again.
Device is not detected over USB even with SW3. nRF52840 recovery is accessible with SW4.

Does nrf desktop programmer work to flash nRF52840?
I've been trying this with no luck.

I hope I wouldn't need an SWD Programmer to flash the RF52840.

Can't put Thingy91 into recovery mode / USB not recognized

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