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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(.