Old signatum have ~700+ MB in blk0001.dat - this is one file now and no have any sence to create any bootstrap,
because bootstrap.dat have the same size.

To make your syncronization faster, add this nodes to config.conf:
place this config in working folder, and run signatum-qt with parameter -conf=config.conf

You can specify working folder using run parameter "-data-dir=folder_name" in this case signatum-qt is portable.