If you encounter the following symptoms, kindly use another brand of +RW discs for recording as the software upgrade is in the process of development : 1. During recording, an “Update” message is shown on the LED display which does not allow you to record on the disc media. 2. After recording, a “Unknown” / “Blank” disc error message appears on display when trying to playback. * For your information, the software upgrade is now available for downloading. Kindly click [here](http://www.p4c.philips.com/cgi-bin/dcbint/cpindex.pl?sct=DVD_HARDDISK_RECORDERS_SU&cat=DVD_HOME_THEATER_CA&grp=HOME_ENTERTAINMENT_GR&session=20070131033741_22.214.171.124&ctn=DVDR3400/05&slg=ENG&mid=Link_Software&hlt=Link_Software” target=“_blank) to download the software upgrade We apologise for any inconvenience caused.