Help! Backup function: DB file replacing not working

Hello everybody,

thank you in advance for your kind answers.
Following this link, Comodo Help,
I backupped on my pc the directory “comodo”; then I restored my android device. Now I am not able to replace the Backup files in the Comodo directory. I was able to rebuild subdirectories, but I am not able to replace my old .db file. Copying process starts an stays on 0%.
I neeed to recover SMS inside the DB. How shall I do it?
thank you for your help