Resolved! Which software can I use the OUT extension?
https://www.st.com/en/embedded-software/stsw-viennarect.html?ecmp=tt9470_gl_link_feb2019&rt=db&id=DB4073The content of the file that can be obtained with GET Software in is the extension OUTI want to write "stsw-viennarect.out" to STNRG388A. Which so...