i did a huge mistake by modifying my greeter.ui. I can´t access my pi anymore. The whole screen is blinking ALT+CTRL F3 or F2 or F1 are not working. SSH is not activiated yet. What can i do? I don´t want to lose my configuration. Does anybody knows how i can repair this? I already tried to use my windows pc to read the SD-Card, but i wasn´t able to locate the greeter.ui file to substitute it.