Headunit Firmware Dump?

[nanaisu]

Hi all,
apologies if this is posted in the wrong place, I'm more of a lurker than a poster. I've been reading up on a few threads related to coding and was wondering if anyone had dumped the firmware and or filesystem of the headunit for the Supra.
I'm more used to REing malware and not headunit firmware or car hacking in generally... but I'd love to give it a shot if it's already been dumped (or if someone has general instructions that may apply to the Supra.)
TIA

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[QSupra99]

Apologize to revive a old thread/post, But have you found any dumps? im in the process of RE it and finding a way to change the seatbelt / warning gong/sound to custom Audio.

Thank you