Upgraded my UE46b8000 with UA46b8000 - sound has disappeared

[erdem_ua]

How could you do that? I think TV has a protection for cross-flashing...

I think your ExLink port are disabled due new firmwares.
Could you enable telnet via Content library?
If you could, than you have a chance to revert it...

[juusso]

Solution: you can use Force Firmware back v0.2 to flash right firmware. Are USB ports accessible on TV? Go to this topic and make all steeps including step7.
You can easily restore European firmware and off course sound should be back.

Another way (but with little chance because of latest firmware deletes some partitions). If you have ex-link cable and u-boot working, you can flash european firmware back. Solder or buy ExLink and come back for further instructions or If you do not have console/u-boot over ExLink, check if you able to activate telnet from ContentLibrary.