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===Protocol===
===Protocol===
−The communication protocol between the 3DS system and the 3DS gamecard has changed completely in comparison with the DS and DSi gamecard communication protocol.
+The communication protocol between the 3DS system and the 3DS gamecard has changed almost completely in comparison with the DS and DSi gamecard communication protocol.
+After the seventh transfer, commands change size from 8 bytes to 16 bytes. Possibly a new encryption is used, such as AES CTR.
+Here's a set of sample gamecard commands that a 3DS sends to a 3DS gamecard:
+{| class="wikitable" border="1"
+|-
+! Size
+! Command
+! Description
+|-
+|2000
+|9F00000000000000
+| Reset
+|-
+|0000
+|71C93FE9BB0A3B18
+| Unknown
+|-
+|0004
+|9000000000000000
+| Get gamecard ID, response=9000FEC2
+|-
+|0004
+|9000000000000000
+| Get gamecard ID, response=9000FEC2
+|-
+|0004
+|A000000000000000
+| Unknown
+|-
+|0000
+|3E00000000000000
+| Unknown
+|-
+|07EC
+|82000000000000000000000000000000
+| Get header
+|-
+|05E3
+|F32C92D85C9D44DED3E0E41DBE7C90D9
+| Encrypted, unknown
+|-
+|0332
+|696B9D8582FB55D31B68CAFE70C74A95
+| Encrypted, unknown
+|-
+|0332
+|BAA4812CA0AC9C5D19399530E3ACCCAB
+| Encrypted, unknown
+|-
+|032E
+|178E427C22D87ADB86387249A97D321A
+| Encrypted, unknown
+|-
+|0332
+|E06019B1BD5C9130ED6A4D9F4A9E7193
+| Encrypted, unknown
+|-
+|0332
+|4E0D224862523BBFE2E6255F80E15F37
+| Encrypted, unknown
+|}
+The header command has some initial dummy bytes, and eventually responds with a 0x200 byte header. Here's an example for Lego Starwars 3:
+ 0000000: 00 8c 03 00 00 00 04 00 00 00 00 00 00 00 00 00 ................
+ 0000010: b3 cf fb c6 6a b1 cb 20 32 af ce 35 d4 1c 74 c9 ....j.. 2..5..t.
+ 0000020: 8e 6b 27 2f 08 01 28 3b d4 30 de 44 37 f5 b0 46 .k'/..(;.0.D7..F
+ 0000030: 91 59 d7 38 33 48 df 83 fd 71 84 2c 00 00 00 00 .Y.83H...q.,....
+ 0000040: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
+ 0000050: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
+ 0000060: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
+ 0000070: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
+ 0000080: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
+ 0000090: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
+ 00000a0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
+ 00000b0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
+ 00000c0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
+ 00000d0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
+ 00000e0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
+ 00000f0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
+ 0000100: 4e 43 43 48 7a 7f 0e 00 00 8c 03 00 00 00 04 00 NCCHz...........
+ 0000110: 36 34 02 00 00 00 00 00 00 8c 03 00 00 00 04 00 64..............
+ 0000120: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
+ 0000130: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
+ 0000140: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
+ 0000150: 43 54 52 2d 50 2d 41 4c 47 50 00 00 00 00 00 00 CTR-P-ALGP......
+ 0000160: 0c 27 e3 c1 de 7b 2a e2 d3 11 4f 32 a4 ee bf 46 .'...{*...O2...F
+ 0000170: 9a fd 0c f3 52 c1 1d 49 84 c2 a9 f1 d2 14 4c 63 ....R..I......Lc
+ 0000180: 00 04 00 00 00 00 00 00 00 00 00 00 01 03 00 00 ................
+ 0000190: 05 00 00 00 01 00 00 00 00 00 00 00 00 00 00 00 ................
+ 00001a0: 06 00 00 00 1c 0a 00 00 01 00 00 00 00 00 00 00 ................
+ 00001b0: 22 0a 00 00 58 75 0e 00 01 00 00 00 00 00 00 00 "...Xu..........
+ 00001c0: 13 0c 04 26 15 f6 47 c4 c6 32 25 ea 9e 67 f8 a2 ...&..G..2%..g..
+ 00001d0: 7b 15 24 6b 88 fb c7 a9 27 25 7b 84 97 7b 78 7b {.$k....'%{..{x{
+ 00001e0: a6 5b ee 10 60 bb 6a 68 21 bb ce c6 00 03 5b 7e .[..`.jh!.....[~
+ 00001f0: 64 fb 6e ac a7 f0 96 0c fb 1f 5a 37 08 77 28 f7 d.n.......Z7.w(.