Odyssey decrypting the firmware upgrade files

[Godzil]

As markun seems to be "dead" I'll do the same dump as the one he do before on the latest Cybook Odyssey firmware (5.2.1790 if I'm correct) :

00000004  a7 ea 0c aa e2 0c 1a 51  ae f0 a8 90 72 96 02 fe  |.......Q....r...|
00000014  4a 8f 0f 61 ac 78 e8 db  63 c3 b3 ff b6 89 29 20  |J..a.x..c.....) |
00000024  a8 c5 b8 db d5 fe d9 06  a8 c5 b8 db d5 fe d9 06  |................|
00000034  a8 c5 b8 db d5 fe d9 06  b5 dd a6 bc d0 ae 4b 4d  |..............KM|
00000044  24 3c c3 7b 5d 14 cd 47  85 64 f2 39 ec 07 ce ed  |$<.{]..G.d.9....|
00000054  61 bc be bb 93 50 9f 2b  4e 8c dd 62 49 5b 37 3d  |a....P.+N..bI[7=|
00000064  4f a8 a1 0f e6 14 fa 13  22 e2 d5 95 4b 65 29 04  |O......."...Ke).|
00000074  98 94 39 83 47 da db 37  3e bf 84 89 19 90 ac 21  |..9.G..7>......!|

Funnily it's seems that something have changed (a little bit) since the 4th occurence on the "64" line is no longuer here.

03e9bce4  f8 d4 26 5c bc fc b6 64  ec a6 4a a1 0e 49 cc 00  |..&\...d..J..I..|
03e9bcf4  d8 53 a1 00 39 35 b6 a2  a8 c5 b8 db d5 fe d9 06  |.S..95..........|
03e9bd04  0b b7 a1 44 e4 35 a1 b3  ce 2a f2 30 76 14 68 b0  |...D.5...*.0v.h.|
03e9bd14  e2 d2 3a c0 9b 14 df bb  06 f4 31 ba 29 30 fb ac  |..:.......1.)0..|
03e9bd24  00 4a 03 9c 9e 8a 1c 35  5a cd dd 73 9e 5c 9a 1e  |.J.....5Z..s.\..|
03e9bd34  af 63 8c 7c 86 c4 f7 d0  82 c4 a9 1d 10 de 90 b6  |.c.|............|
03e9bd44  07 5e 85 ec 1b 08 f8 2b  ef 10 33 e1 13 89 bf 1b  |.^.....+..3.....|
03e9bd54  32 7c ad 0a a4 db d7 09  89 06 09 ea 66 6a 44 2c  |2|..........fjD,|
03e9bd64  b7 cb 71 d9 5e dc 7b c4  00 ca ae 87 24 8c 56 e7  |..q.^.{.....$.V.|
03e9bd74  c3 43 16 6e c3 8a 50 e1  3f 40 09 28 d1 b1 65 d7  |.C.n..P.?@.(..e.|
03e9bd84  47 41 4d 45 5f 4f 56 45  52                       |GAME_OVER|

But the last one is still here ^^