V 1.52.00 is only released to HTS4561/12 and HTS4562/12

V 1.52.00 includes the following changes:
• Improved Audio Sync
• Fixed system bugs

The former firmware version includes the following changes:
• Fix auto standby issue (V1.47.10 MCU V36.05)
• Fix issue with RWSS5510 Wireless Rear Surround module (V1.47.10 MCU V36.05)
• Improved system performance (V1.47.10)
• Solved wireless speaker volume adjustment issue (V1.27 MCU V36.01)
• Improved playability (V1.27 MCU V36.01)
• Improved User Interface (V1.27)
• Improved playability (V1.27)

Kindly download the software at: www.philips.com/support