I did this before, but it still didn't work. I guessed later that it might be due to missing mtdev.tcz.md5.txt, but it was too late. I did something impulsive: I had deleted all of md5.txt. The solution I've come up with now is to use WGET to download md5.txt from the repository for all the extensions, but I don't know exactly how to write the command because I'm really new. My friend, can you tell me exactly how to write this command? Or do you have any other way? If not, I won't bother you, I have to reinstall the system.