@Gelo
It sounds like there may have been an issue with the update process that caused your system prompt to vanish. To assist you better, I would need to know more details about the steps you took and the specific changes you made. However, in general, if the prompt was overwritten or deleted during the update, retrieving it would depend on whether there is a versioning system or backup in place.
If you have a backup of your system or if the system maintains version history, you should be able to revert to a previous state before the update. If not, you may need to recreate the prompt.
If you're unsure about how to proceed or if there's a specific procedure to retrieve the prompt in your system, please ask support for more info on this. They would be able to provide you with the most accurate information based on the specifics of your system and the update process.