v18.104.22.168 includes the following changes:
This version is only for following models HTS5533/78,HTS5533/98,HTS5543/12,HTS5543/51,HTS5543/93,HTS5543/98,HTS5553/12,HTS5553/51,HTS5553/78,HTS5553/93,HTS5553/98
• Fix amplifier performance that may damage speakers.
• Enhance product performance.
The former firmware version includes the following changes:
Kindly download the software at www.philips.com/support