Hi there,
I’d like to start by apologizing for not getting back to you before. Unfortunately, we have received an unusual amount of support requests, which is delaying our response time, and we generally answer in the order received.
From your reply, it is not clear if Jetpak crashed or Jetpack Boost, so to fix this issue, please log in to your site via _FTP_ or _SFTP_ or _cPanel > File Manager_ and go to the wp-content/plugins/
folder and delete the folder named jetpack
and jetpack-boost
.
Once done, your website will likely start working again, and you will be able to log in to WordPress Admin. After logging in to WordPress Admin, reinstall the Jetpack and Jetpack Boost plugin from _WordPress Admin > Plugins > Add New_, and reconnect them.