I've got Philips 42PFL7603D/10 and installed that update. The firmware version is 000.064.076.000 dated 2009-04-03
Followed the steps exactly as suggested in the update manual. After powering the TV off using the remote control it restarted itself and went into loops of powering up, staying on for few seconds with a blank screen then restarting again.
I could not get it back.
Then spent whole day searching and luckily managed to collect enough information to fix it.
If you have the same problem and follow the steps below you should be able to get your telly back up and running.
However, be careful as Philips support says that this can invalidate your warranty because it is not included in any official public documentation.
This software update process is different to when you are updating a working television.
You will need a USB stick. Backup all your data on it and format it to FAT32.
(To format it go to My Computer, right click on the USB drive in the list and select Format. Choose Quick format , File system: FAT32, Click START)
Now create a new folder with name UPGRADES
The upgrade application searches for upgrade file in that folder only. If you put it anywhere else it won't work.
I tried using the same upgrade file that made my TV corrupt just to test if a re-load would help. It showed completed successfully again, but result after restart was the same (On/Off/On/Off etc.)
So I downloaded an older version. I will post a link to it later. If you have an older known working version of firmware feel free to use it. Post a link to it if possible.
Unzip the archive and copy the autorun.upg file to the UPGRADES folder on the USB stick.
Here are the steps to access the upgrade application on your TV and successfully change the software to the older, but working version.
1. Unplug all attached devices and disconnect the TV from the mains.
2. Plug the USB stick into the USB port of the TV.
3. Take the remote control and keep the OK button pressed whilst plugging the TV mains cable into the socket until the upgrade application appears on the screen.(Can take 10 - 15 seconds)
4. The application will scan the USB stick and should list the autorun.upg file
5. Press the red button on your remote to start and OK if you get a message about upgrading to the same or older version of firmware.
6. The upgrade should finish successfully.
7. Unplug the USB stick and power off using the remote control.
After the restart all should be back up and running. However, you will need to configure channels etc.
Hope this will work for you as it did for me.