recover \boot\config.txt after unsucess overclock

[Marcos]

Hi, I tried to overclock and now my raspberry pi 3 does not turn on, it goes without signal, I tried to access the network to change the settings but I can not, when accessing the sd card through linux in the boot folder only a .keep file appears, there is some form of to change the wrong configuration I made in the \ boot \ config.txt file without having to reinstall everything and lose all my settings?

[Gaetan]

@marcos Yes, you can undo the overclock in the config.txt

[Marcos]

@gaetan I can't acess config.txt

[Gaetan]

@marcos even when you put your sd card information your pc ?

[Marcos]

@gaetan yes but /boot folder dont show files