Stefan,
The release notes at the link below have details of 2.24.5.6 in section 5.1.1.
SWI9X30C 2.0 Release 18.2
This section describes changes since the previous major release.
5.1 Software Release Description
5.1.1 Release identification
Component Revision
Boot loader SWI9X30C_02.24.05.06
Application SWI9X30C_02.24.05.06
Regards
Matt