Hi everyone i wanted to know if i opened an old pulumi project and i just opened it to continue work on it how can i get all the configs and stacks imported pulumi on my device can't read the pulumi.yaml or pulumi.dev.yaml

Depends where your stacks where saved. If you were using the pulumi service they'll still be saved on the service with their latest config. If you just had them saved to local files, S3 or similar you'll have to restore them yourself but they should also have the last config used saved with them.

if the last configs was lost how can i restore them

pulumi config refresh

will restore them from the backend if it can