If this is in hexidecimal notation, then you have some terminology confusion.
00 00 00 00 00
|__| ^
\ |
byte nibble
A byte is two nibbles, and a nibble is 4 bits.
Decimal Hex Binary
0 0 0000 <- You went from here...
1 1 0001
2 2 0010
3 3 0011
4 4 0100
5 5 0101
6 6 0110 <- ...to here, a change in two bits of one nibble.
7 7 0111
8 8 1000
9 9 1001
10 a 1010
11 b 1011
12 c 1100
13 d 1101
14 e 1110
15 f 1111