Toshiba/Vestel 50UL2063DB rebooting whenever it feels like

[spleenharvester]

We've had this one about 4 years now, for the past year or so it's been rebooting roughly once a week. Always in the middle of playback from an Xbox Series S. Not sure if hardware or a software configuration issue as we changed our setup a while ago.

I've tried putting the latest firmware .bin on a FAT32 formatted 4GB USB2 stick, 28617342_MB230_TOSHIBA_QUI_KYLO_V051300_SVN_328380, which I am 95% sure is the correct file. I then tried all the usual Vestel tricks (plug in USB stick, unplug TV, plug in TV while holding OK and/or power button). No response, it just boots straight to the interface.

EDIT: Nvm just seen the software is already on this version, that's probably why no response I imagine. Any other ideas for what I can try?

[spleenharvester]

Haven't pulled it apart yet but attached a pic of what should be the PSU board which I found online. 17IPS62 23521004

E: Just took a look through the vents, it looks like the board is actually a 17IPS72.

[yokoono]

You have the software from the manufacturer below. Unzip and put the 2 files directly on the stick. Try at your own risk.
https://files.fm/u/fjkfrebkcg
Valid for 3 days.

[spleenharvester]

Thanks for this - I tried various files but the TV gets stuck on "Preparing to update..." or something like that. I gave up in the end.

[Davi.p]

Which is the AV board?