c4eva om Modern Warfare 3, dashboard updates m.m.

http://c4evaspeaks.com/preview-dash-...s-up-with-mw3/

Citat:

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Microsoft has rolled out yet another update to the Xbox 360 Fall 2011 Preview Dash, this time bringing it to version 2.0.14696.0. During the preview thus far, backups of MW3, for example, have been observed to flip states between working and not working — twice over. The same has been found with several other games. It’s no surprise that many are wondering just WTF is going on.

Contrary to recent rumors, however, MS has not been reverting the dae.bin change/silent update. In actuality, following the silent update of the dae.bin on retail dash 13604, it was quickly determined that MS has been issuing a series of TitleUpdates for certain games (e.g. MW3) alongside the dash updates and dae.bin changes. These TUs appear to be testing the ability for Microsoft to enable/disable triggering of AP2.5 challenges against the disc via the multi-table dae.bin. This is accomplished by patching the default.xex executable with patch files (“.xexp”s) in the TU which patch in or out the Disc ID within the xex header. When the Disc ID is present, and the game has an associated entry in the dae.bin tables, the AP2.5 challenges are triggered. Conversely, when the ID is missing, the system will not be able to find an associated entry in the dae.bin tables, and therefore no AP2.5 checks are performed. This accounts for the success of “TU trick” that people have been using to temporarily bypass the updated AP2.5 challenges (clearing the cache of existing/newer TUs and tricking the 360 into using an older TU that doesn’t patch the Disc ID into the xex).

Being ranked at #1 for Xbox LIVE activity according to the latest charts, MW3 makes an ideal candidate for these types of tests by offering the largest possible test group. Based on this, Microsoft have shown that they now have two methods by which to control whether a game is AP2.5-active. A title may be AP2.5-activated either through the addition of associated entries in the dae.bin tables, and as it now stands, by way of TitleUpdates patching in or out the Disc ID.

Now, you may be asking yourself why MS would want to deactivate AP2.5 on a game. A team member suggested that this may be to allow MS a method for easily disabling AP2.5 for a particular game if it causes issues on retail consoles (this may coincide with the reports of retail copies failing AP2.5 challenges and showing “Disc Unsupported” errors). Purely speculating here, but testing of these TitleUpdates may also be a sign that Microsoft is preparing to issue AP2.5-enabling TUs for some of the more popular older XGD2 games beyond the original six affected (Assassin’s Creed: Brotherhood, Call of Duty: Black Ops, Call of Duty: Modern Warfare 2, Fable III, Halo Reach, and Need for Speed: Hot Pursuit).

*UPDATE* [2011-11-23 11:37AM UTC]
As an added note in response to questions we’ve received, the usage of TitleUpdates in (de)activating AP2.5 in no way affects c4eva’s “silver bullet” solution being implemented in iXtreme LT+ v3.0. C4eva noted in private earlier that with his solution, all current and future effort put into AP2.5 by MS is all for nothing.

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C4eva shared with us in private today some further details about the upcoming iXtreme LT+ v3.0, which is now targetted for release sometime after December 6, 2011. Earlier this week, Microsoft’s Major Nelson announced December 6 as the official release date for the final version of its Fall 2011 Dashboard Update. Scheduling LT+ v3.0 for release after this date will allow c4eva and the team a chance to analyze the final update so as to ensure no additional changes to v3.0 are necessary.

With the new iXtreme LT+ v3.0, original game discs will need to be analyzed by Xbox Backup Creator in order to gain disc topology data. This data replaces the need for AP2.5/dae.bin data and enables any AP2.5 challenge to be answered correctly. C4eva noted that the topology data method is very efficient — using only 24kB of space — and extremely accurate. Due to differences between them, each game will require its own individual set of topology data. A risk of backups being detected poses itself if the same topology data is used between two different titles. This risk is mitigated by using abgx360 to make certain that the backup contains the appropriate topology data.

Backups will remain the same layout, but will either need to have the topology data inserted by the new abgx360, or be re-dumped with the new Xbox Backup Creator. C4eva reconfirmed that all current AP2.5-active XGD2 and XGD3 backups with old AP25 replay data are not backward-compatible with iXtreme LT+ v3.0 and will indeed need to be patched or re-dumped and re-burned. Non-AP2.5 titles, however, will remain unchanged and do not require re-burning.