How to downgrade from MFW 1.3.0 and unbrick nRF9160 DK

Question

Hi, 
 we just uploaded MFW 1.3.0 to our nRF9160 DKs that had engineering revision of nRF9160. They seem to be now bricked and it is not possible to downgrade to MFW 1.2 via the Programmer app. 
 Is there process to dowgnrade the MFW 1.3.0 to MFW 1.2? Why do you even allow to update MFW in engineering revision if it bricks the device? 
 Lukas

Lukáš · Answer

Hello Heidi, we bricked our two DKs that were bought at the same time (approx. 1,5 years ago?). When it failed for the first time, we thought it is some kind of error, but then we tried to update the MFW on the second DK and it behaved exactly the same. 
 I sent you our details in a private message. Thanks a lot for your kindness and help!