Hi Lapka,
CR X1 did not support connecting to SQL 2008 R2 server, it requires the SQL Native 10 client. There are limitations posted by Microsoft when using the MDAC driver to connect to 2008.
Only option may be to upgrade to CR 2011 or CR 2013 and then update each report manually or possibly using the ReplaceConnection API ( search SCN and KBA systems for samples on how to ) to update the reports on the fly.
But always better to start off with valid reports with valid connection properties.
Don