@dafman any update on this? Keen to find out the outcome.
Update.
After corresponding with Sony, I agreed to a discount on a new TV. The discount wasn’t as much as I requested, but enough to not warrant the extra time and effort to take to Disputes tribunal.
Although the final outcome fell a little short of my expectations, Sony have been good to deal with. I did offer upfront that I wouldn’t disclose final discount to maximise my bargaining position, so will keep to my undertaking.
Although I am getting a new TV at a discount, I would have preferred that my TV was not bricked in the first place.
Sony have advised they will arrange collection of my bricked TV after delivery of new - I presume to validate my complaint. Good for me, I don’t need to arrange taking it to e-waste.
If you can find another TV exactly the same, you could copy the firmware from it's flash to an image file and use that to reflash the TV which failed its firmware update.
Two methods to do this, not guaranteed to work but worth a try if you can get hold of a working TV to copy firmware from.
1st method is to use a USB TTL serial adapter, connect to the 4 pin header on the mainboard and establish a console session via Putty.exe, from here you should be able to interrupt the u-boot bootloader (most are u-boot) and then download the entire flash via TFTP from the working TV to an image file - use the same method to flash it back to the faulty TV.
2nd method if the 1st method fails (eg locked bootloader) is to use JTAG via a RaspberryPi - download the entire flash to image and flash it back to faulty TV.
You will also likely end up with the same MAC and serial numbers from the donor TV's firmware, although wont affect its operation. If both above methods fail, eg if JTAG fuses have been blown by manufacturer - then your only other option is to de-solder the flash rom chip via hot air reflow gun, put it in a reader and download the firmware from donor TV that way, use the same method to write it back to faulty TV's flash rom
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