Toshiba 32TL838: video flickering after fw upgrade in menus, using HDMI input

Question

Hi,
yesterday I upgraded my 32TL838's firmware to version 6.4.0Y.1 / 94.6.27.8 using the network upgrade feature.
After the upgrade I reset the TV to start over with factory settings.
During the quick setup after the reset I noticed a very poor video quality. The whole image flickered, had a ghost effect and looked interlaced. The menus were almost unreadable.
After completing the setup the TV switched to normal TV mode (DTV cable) and at least the tv picture looked quite normal. While cable TV input is selected, I can also open menus like before, they're displayed correctly.
But as soon as I switch to HDMI input, the picture is getting nuts again, just as during the initial setup, including the TV's menu overlays. Sometimes it's getting stable for maybe 30 seconds but then it's crippled again.
Some words about my setup: the TV uses only HDMI input 1 and the cable input, nothing else is connected.
The HDMI input links to an Onkyo TX-SR508 AV receiver that is being fed by a Fantec 3DS4600 media player and BDP-S373 BluRay player.
Because I expect the what-about-your-HDMI-cabling question, I exchanged the HDMI cables but as expected that did not help at all.
At least I seem to be successful in working around the problem when using the Fantec player.
Before I upgraded the firmware I was able to use the player with 1080p/60Hz and the player was setup accordingly.
Now I switched to 1080p/50Hz and the video picture looks okay again. (However I did only a short test and as I said, sometimes_
the picture is okay for a short time.)
Unfortunately my BluRay player has no menu to change the frequency, so watching BluRay or the online services the player offers, is impossible.
So what can I do now? A firmware downgrade (if that's possible) would be a quick temporary workaround I could accept. But in the medium term I expect Toshiba to restore the features they promoted and for which I paid.
(Youtube stopped working with the old firmware and it looks as if 1080p/60Hz doesn't work anymore with the latest firmware.)
Does anybody know a way to downgrade the firmware using an USB key? I already downloaded the previuos release tl838_853886.bin but I don't have a clou how (and if) it can be installed.
Thanks for your hints
belektro

Answer 1

> Before I upgraded the firmware I was able to use the player with 1080p/60Hz and the player was setup accordingly.
I think you mixed simply the PAL and NTCS settings.
Usually all external players provide an option where you could choose between PAL and NTSC.
NTSC standard is the common one for countries in South / North America and Japan,
The PAL is used in Europe and some countries in Asia.
Both PAL and NTCS support 24p (24 frames per second) but most output for PAL and NTSC use interlaced frames which means that:
NTSC (60Hz) supports fps 60i or 30p
PAL (50Hz) generally uses 50i or 25p;
Probably the external player supports PAL settings and its set to 50Hz and therefore its play properly using the 1080/50Hz.