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Confirmed, downgrading allows the Kiosk disk to run again!
So I have now proved that kernel 2.0.2858 (won't boot the kiosk disk) can be downgraded to 2.0.1888 and that WILL boot the kiosk disk (or bits of it) from CD-R. This was proved with a mobo for which the DVD key is NOT known.
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Confermata la notizia del downgrade del kernel, confermato inoltre che dal 2.0.2858, il kiosk disk viene blacklistato dalla console.
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Until the 4552 update that is exactly what I was doing, erasing/corrupting part of the patch and rebooting. The 360 fell back to the previous patch or, if no patch has been applied, the Base Kernel.
After the 4552 the 360 WILL NOT BOOT unless the 4552 patch is present in flash.
More than likely MS has blown an efuse or two with the 4552 update. The efuses are located in the CPU. Anyone interested in learning more should download my 360 CPU datasheet V1.5 from the beginning of March 2005.
The Hypervisor only needs to test a flag in the processor (blown eFuse) against a flag in the patch to make a boot/no boot decision, there could be any number of these flags but at a rate of 1 eFuse / year then 32 would be more than ample. There's no need to actually modify the hypervisor code at all.
The efuses act like standard memory and probably contain the HID register data as well. I would guess there are 1K-2K worth of efuses.
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Fino al kernel 4552 era possibile corrompere o cancellare parte delle patch archiviate nella flash della console, che poi si riavviava con un kernel precedente o, addirittura, con la versione base.
Dopo la release della patch 4552, la console, se non e' presente la suddetta patch nella memoria, non fara' il boot. Questa contromisura si crede risieda nella cpu, che aveno do meno una flag abilitata da l'ok per bootare o meno.
- Conclusioni.
Per adesso non e' proprio un niente di fatto, ma da poco margine di sperimentazione, causa introduzione di misure di sicurezza, conscie o meno, da parte di microsoft, nella console. Come gia' detto in precedenza, sono piccoli passi che lasciano ben sperare, per un futuro piu' autonomo e libero della nostra amatissima console.
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