Hello DESERTEUR FETHI,

I think, you are searching for an Firmwareupdate for a S7-1200?
Here the search result I found: CPU Firmware update V4.2.1

Hope within this documents you will find the information you are looking for.
If you need a more detailed reply please share more information about the hardware and your situation at the moment.

Please try to publish your question in english language. This will be helpful get faster replies and to get in contact with a larger number of community members . Most of the users here are not native english. But we all try to communicate in the same language.

Best regards
Sabine

New question published by MOIMOIMOI is split to a separate thread with the subject tried to download the firmware V4.1.2 to downgrade the PLC version.

Best regards
Jen_Moderator