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[ACNH] BCAT forging ?
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<blockquote data-quote="Alree" data-source="post: 9072438" data-attributes="member: 480206"><p>Well in fact BCAT are really easy to make.</p><p>Here what we have, and how you can create a BCAT.</p><p></p><p>First BCAT was like this:</p><p></p><p>[CODE]{</p><p>"mFlagVer": 1,</p><p>"mRegion": "JP,AU,KHT,CN"</p><p>"mFlagId": 0,</p><p>"mFlagName": "BCAT_EventFlag_000",</p><p>"mStartDateTime": "1999-12-31T00:00:00",</p><p>"mEndDateTime": "2061-01-01T23:59:59",</p><p>"mIsUseNetworkTime": false,</p><p>"mIsUseNetworkTimeZone": false</p><p>}[/CODE]</p><p></p><p>This was the first ever version of BCAT for ACNH, and this one is "region locked". So you will find 3 BCAT for Easter Event on for Oceania/Japan, another for USA, and finally one for Europe</p><p>What changed after that is mostly the version of BCAT.</p><p></p><p>MayDay was like this:</p><p>[CODE]{</p><p>"mFlagVer": 2,</p><p>"mFlagId": 1,</p><p>"mFlagName": "BCAT_EventFlag_001",</p><p>"mStartDateTime": "1999-12-31T00:00:00",</p><p>"mEndDateTime": "2061-01-01T23:59:59",</p><p>"mIsUseNetworkTime": false,</p><p>"mIsUseNetworkTimeZone": false</p><p>}[/CODE]</p><p></p><p>AS you see, "mFlagVer" increased to "2" and "mFlagId" to "1".</p><p>mFlagVer 2 doesn't need a "region to be specified so go on, we have a pattern</p><p></p><p>Museum Day, only change was "mFlagId" increased to 2 and BCAT name changed</p><p>[CODE]{</p><p>"mFlagVer": 2,</p><p>"mFlagId": 2,</p><p>"mFlagName": "BCAT_EventFlag_002",</p><p>"mStartDateTime": "1999-12-31T00:00:00",</p><p>"mEndDateTime": "2061-01-01T23:59:59",</p><p>"mIsUseNetworkTime": false,</p><p>"mIsUseNetworkTimeZone": false</p><p>}[/CODE]</p><p></p><p>Wedding ? change was "mFlagId" increased to 3 and BCAT name changed</p><p>[CODE]{</p><p>"mFlagVer": 2,</p><p>"mFlagId": 3,</p><p>"mFlagName": "BCAT_EventFlag_003",</p><p>"mStartDateTime": "1999-12-31T00:00:00",</p><p>"mEndDateTime": "2061-01-01T23:59:59",</p><p>"mIsUseNetworkTime": false,</p><p>"mIsUseNetworkTimeZone": false</p><p>}[/CODE]</p><p></p><p>So next step is, how does Switch could validate this files ? ... files.meta</p><p>This file is simple in fact, as already showed:</p><p></p><p><img src="https://gbatemp.net/attachments/upload_2020-5-7_11-19-58-png.208092/" alt="" class="fr-fic fr-dii fr-draggable " style="" /></p><p></p><p>So what we need to add at the end of this file is information from BACT files..</p><p>FileName .. not really difficult.</p><p>A random key, but it's in fact unused. so whatever you want and you'll see that "forged" BCAT didn't have same number here.</p><p>File Size here always 159 bytes</p><p>And the MD5 Hash of file "BCAT_EventFlag_00x" generated. who is Truncated and reverted..</p><p></p><p>Now, how I know there is a 1.2.1D and a 4th BCAT ?</p><p></p><p>well every BCAT supported by actual version is in "romfs/Bcsv/EventFlagsLandParam.bcsv"</p><p>when you open it... we have this BCAT 004 mentionned.. and this one trigger the 1.2.1D</p><p></p><p>[ATTACH=full]210874[/ATTACH]</p><p></p><p></p><p>[MERGED]auto[/MERGED]</p><p></p><p></p><p></p><p>Only real difference is the "Random Key" as I say, this is unused in fact.</p><p>So this is another forged wedding BCAT included in Museum BCAT that's why you have 1.2.1.C</p><p>So we just increased it, but we do not start with the same. That's the difference.</p><p>And this is the only spot where our BCAT could differ from those provided by Nintendo. Cause we don't know what the number is before official BCAT release.</p><p></p><p>[ATTACH=full]210873[/ATTACH]</p></blockquote><p></p>
[QUOTE="Alree, post: 9072438, member: 480206"] Well in fact BCAT are really easy to make. Here what we have, and how you can create a BCAT. First BCAT was like this: [CODE]{ "mFlagVer": 1, "mRegion": "JP,AU,KHT,CN" "mFlagId": 0, "mFlagName": "BCAT_EventFlag_000", "mStartDateTime": "1999-12-31T00:00:00", "mEndDateTime": "2061-01-01T23:59:59", "mIsUseNetworkTime": false, "mIsUseNetworkTimeZone": false }[/CODE] This was the first ever version of BCAT for ACNH, and this one is "region locked". So you will find 3 BCAT for Easter Event on for Oceania/Japan, another for USA, and finally one for Europe What changed after that is mostly the version of BCAT. MayDay was like this: [CODE]{ "mFlagVer": 2, "mFlagId": 1, "mFlagName": "BCAT_EventFlag_001", "mStartDateTime": "1999-12-31T00:00:00", "mEndDateTime": "2061-01-01T23:59:59", "mIsUseNetworkTime": false, "mIsUseNetworkTimeZone": false }[/CODE] AS you see, "mFlagVer" increased to "2" and "mFlagId" to "1". mFlagVer 2 doesn't need a "region to be specified so go on, we have a pattern Museum Day, only change was "mFlagId" increased to 2 and BCAT name changed [CODE]{ "mFlagVer": 2, "mFlagId": 2, "mFlagName": "BCAT_EventFlag_002", "mStartDateTime": "1999-12-31T00:00:00", "mEndDateTime": "2061-01-01T23:59:59", "mIsUseNetworkTime": false, "mIsUseNetworkTimeZone": false }[/CODE] Wedding ? change was "mFlagId" increased to 3 and BCAT name changed [CODE]{ "mFlagVer": 2, "mFlagId": 3, "mFlagName": "BCAT_EventFlag_003", "mStartDateTime": "1999-12-31T00:00:00", "mEndDateTime": "2061-01-01T23:59:59", "mIsUseNetworkTime": false, "mIsUseNetworkTimeZone": false }[/CODE] So next step is, how does Switch could validate this files ? ... files.meta This file is simple in fact, as already showed: [IMG]https://gbatemp.net/attachments/upload_2020-5-7_11-19-58-png.208092/[/IMG] So what we need to add at the end of this file is information from BACT files.. FileName .. not really difficult. A random key, but it's in fact unused. so whatever you want and you'll see that "forged" BCAT didn't have same number here. File Size here always 159 bytes And the MD5 Hash of file "BCAT_EventFlag_00x" generated. who is Truncated and reverted.. Now, how I know there is a 1.2.1D and a 4th BCAT ? well every BCAT supported by actual version is in "romfs/Bcsv/EventFlagsLandParam.bcsv" when you open it... we have this BCAT 004 mentionned.. and this one trigger the 1.2.1D [ATTACH=full]210874[/ATTACH] [MERGED]auto[/MERGED] Only real difference is the "Random Key" as I say, this is unused in fact. So this is another forged wedding BCAT included in Museum BCAT that's why you have 1.2.1.C So we just increased it, but we do not start with the same. That's the difference. And this is the only spot where our BCAT could differ from those provided by Nintendo. Cause we don't know what the number is before official BCAT release. [ATTACH=full]210873[/ATTACH] [/QUOTE]
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