Hi!
I'm having several problems with skywire nano modules and its development kit, I'm working with three different skywire nano modules (version A x2 and version C). And I got different problems, firstly i have tried to use AT commands on modules (with following the user manual: https://nimbelink.com/Documentation/Development_Kits/NL-SWNDK/1002398_NL-SWNDK_UserManual.pdf), only one of the version A gives response to those commands but not for all the time, sometimes it returns nothing just like the other modules. I'm using Tera Term and LTE Link Monitor. I get time out errors from the link monitor, and nothing from the tera term (also one can see the tera term's serial port configurations) as shown in the below figure.



I also tried to flash a sample program for all the versions by using nRF Connect SDK (v1.7.1), i only got result from the version C, the program successfully flashed however didn't work properly (i followed these steps for this: https://developer.nimbelink.com/skywire_nano_public_doc/app_development/quick_start/#first-time-flash):


For the other versions, i got a protection error. I suppose this error caused by readback protection, so i tried to recover modules by using "nrfjprog --recover -f NRF91" command but that didn't work either:


Any idea how to fix those issues?
Thanks in advance