Hi DaneLLL!
Thanks a lot for your comment. I applied it yesterday morning just before your reply and it works. However, I cannot find the reason behind it. I was at the beginning of my work so re-flashing didn’t cause much problem for me but if it repeats in the critical stages, it may be a problem.
I did not install anything external to the system. The open source codes I use are also actively used by hundreds of users. In other words, there was no action that could disrupt the “cleanness” of the system. So, do you have any idea about the reason behind it? Your professional opinion will help me take action against future risks.
Thanks.
Y.