Same issue. Stuck at "sap_security_restrictions" copy using EFS Explorer.
EFS Explorer crashes during copy of file.
Nevertheless, I noticed that I can copy the file to any other directory, and can copy this specific file into /nv/item_files/modem/qmi/uim if I change the name, i.e., "sap_security_restriction" or "sap_security_restrictions1". Seems to be that this name is forbidden to be written at this directory.
Any ideas how to solve this?