hex to bin

$xxd -r -p input.txt output.bin

u@raspberrypi:~ $ cat tmp.txt | head -n 16
00 F0 3E B8 00 00 00 00 00 00 00 00 00 00 00 00 
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 
41 EA 00 03 13 43 9B 07 30 B5 10 D1 0C 68 03 68 
63 40 13 60 4C 68 43 68 63 40 53 60 8C 68 83 68 
63 40 93 60 C9 68 C3 68 4B 40 D3 60 30 BD 00 23 
CD 5C C4 5C 6C 40 D4 54 01 33 10 2B F8 D1 30 BD 
2D E9 F0 4F 8F B0 01 24 0E AD 07 46 0E 46 91 46 
11 46 0D F1 19 00 0D 22 05 F8 20 4D 05 93 DD F8 
68 B0 DD F8 6C 80 9B F0 C9 FE 8D F8 27 40 00 23 
19 9C 38 46 8D F8 26 30 31 46 08 3C 2A 46 23 46 
CD F8 00 B0 CD F8 04 80 00 F0 BE FA 38 BB 0B EB 
04 03 08 EB 04 0A 8D F8 26 00 31 46 8D F8 27 00 
2A 46 8D E8 08 04 38 46 08 23 00 F0 AD FA B0 B9 
18 9B 38 46 8D E8 18 01 0A AC 31 46 4A 46 05 9B 
03 94 00 F0 5F F8 50 B9 20 46 51 46 08 22 9B F0 
8D FE 00 28 14 BF 4F F0 FF 30 00 20 01 E0 4F F0 
u@raspberrypi:~ $ xxd -r -p tmp.txt bcm43455.rom
u@raspberrypi:~ $ hexdump -C bcm43455.rom | head -n 16
00000000  00 f0 3e b8 00 00 00 00  00 00 00 00 00 00 00 00  |..>.............|
00000010  00 00 00 00 00 00 00 00  00 00 00 00 00 00 00 00  |................|
00000020  41 ea 00 03 13 43 9b 07  30 b5 10 d1 0c 68 03 68  |A....C..0....h.h|
00000030  63 40 13 60 4c 68 43 68  63 40 53 60 8c 68 83 68  |c@.`LhChc@S`.h.h|
00000040  63 40 93 60 c9 68 c3 68  4b 40 d3 60 30 bd 00 23  |c@.`.h.hK@.`0..#|
00000050  cd 5c c4 5c 6c 40 d4 54  01 33 10 2b f8 d1 30 bd  |.\.\l@.T.3.+..0.|
00000060  2d e9 f0 4f 8f b0 01 24  0e ad 07 46 0e 46 91 46  |-..O...$...F.F.F|
00000070  11 46 0d f1 19 00 0d 22  05 f8 20 4d 05 93 dd f8  |.F.....".. M....|
00000080  68 b0 dd f8 6c 80 9b f0  c9 fe 8d f8 27 40 00 23  |h...l.......'@.#|
00000090  19 9c 38 46 8d f8 26 30  31 46 08 3c 2a 46 23 46  |..8F..&01F.<*F#F|
000000a0  cd f8 00 b0 cd f8 04 80  00 f0 be fa 38 bb 0b eb  |............8...|
000000b0  04 03 08 eb 04 0a 8d f8  26 00 31 46 8d f8 27 00  |........&.1F..'.|
000000c0  2a 46 8d e8 08 04 38 46  08 23 00 f0 ad fa b0 b9  |*F....8F.#......|
000000d0  18 9b 38 46 8d e8 18 01  0a ac 31 46 4a 46 05 9b  |..8F......1FJF..|
000000e0  03 94 00 f0 5f f8 50 b9  20 46 51 46 08 22 9b f0  |...._.P. FQF."..|
000000f0  8d fe 00 28 14 bf 4f f0  ff 30 00 20 01 e0 4f f0  |...(..O..0. ..O.|