Fail to flash the application using Programmer v4.3.0 in external board (Fanstel board BLG840F) through debug out pin

Hello,

I am trying to flash the nRF9160 application(merge.hex) which is created after build in an external board. The external board is from fanstel - BLG840F. 

Couple of days back, I could easily flash merge.hex using programmer v4.3.0 of nRF connect for desktop. Now suddenly, I am getting this error in the programmer. 

  

I tried using the nrfjprog --recover command but again, it failed (it is because my Fantsel module is connected to the Debug out of nRF9160dk board. And I want to recover Fantsel module not nRF9160dk). Below is the screenshot for the same

I would greatly appreciate any help. 

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