JVC HACK REGION FREE

Password or Code for your Model[4 - digits PIN CODE]:
Three ways.

1. If you input any digits and see on LCD all 4 digits,
and next you see "REGION -" message,
your model with ANY Model Code.

2. You see less 4 entry digits after input any digits.
Look: "Algorithm for Model Code".

3. Your Device go to standby after each bad digit.
Simple Matching. 1-2 minute for right code.

Test version, may be FALSE.

Algorithm for Model Code. Need DVD Version.
Actually For car audio only.

Hypothetically Audio System with DVD Changer
Model Code Range:
0000-0999
For Example: DX-J, DX-U Series:
DVD: 146 CODE: 88

Hypothetically Audio System with DVD
Model Code Range:
1000-1999
For Example: UX-G500/G950:
DVD: 274 CODE: 1107
EX-D11:
DVD: ? CODE: 1073

Hypothetically Car Audio Model
Code Range:
4000-4999

Some Model Code.
1. DVD: 0083 CODE: 4038
2. DVD: 0127 CODE: 4123

1. The first digit of the CODE = 4.
?????

2. The number: 2, 3 and 4 digits
of the CODE [ < ] DVD Version.
?????
Example:
38 < 83 / KD-DV4200
123 < 127 / KD-DV5400
107 < 274 / UX-G500
88 < 146 / DX-J Series

Enumeration of possibilities. :-)

For Example:
DVD Version = 100
Type: 4100 and test all codes
over the range 4000-4100.

For Example:
KD-DV4408, KD-ADV5490, KD-DV5400 and so on.
DVD Version: 127
4000 + 127 = 4127
Tesing Codes:
4127 NO!
4126 NO!
4125 NO!
4124 NO!
4123 YES! BINGO! RIGHT CODE!

Not Work?
Change first digit of the Code.
May be first 4 is for simple car audio only?

Need More Statistics for formula.

Variant
Algorithm:
I think: It is Right Algorithm for Model Code.

Investigation:

Version DVD
274
146
127
83

So ...
[ SHR = bitwise shift right ]
274 SHR 1 = 137 = 1000.1001 (bin)
146 SHR 1 = 73 = 100.1001 (bin)
127 SHR 1 = 63 = 11.1111 (bin)
83 = 101.0011 (bin)
83: Only one byte (Low byte) = without Shift Right

For Example:
For 274:
1000 = High half-byte of 137
1001 = Low half-byte of 137

[ 2 x 4 bits (half-byte) [ 2 x tetrad ] ]
[ Analog: Transfer BIN to HEX ]

Model Code
( Without "First Digit" ! )
( 1107, 0088, 4123, 4038 )
( 1, 0, 4, 4 = "First Digit" )
107 = 110.1011
88 = 101.1000
123 = 111.1011
38 = 10.0110

Munus and Plus operations for High and Low
4-bits (half-bytes, four-bit bytes ) of
[ shr/no shr ] DVD Version and Code.
[ Max 4 bits (half-byte) = 1111 bin = F hex = 15 dec ]

Example 1: 1000-110 = +2(dec) / 1001-1011 = -2(dec)
+2, -2
Example 2: 100-101 = -1(dec) / 1001-1000 = +1(dec)
-1, +1
Example 3: 11-111 = -4(dec) / 1111 - 1011 = +4(dec)
-4, +4
Example 4: 101-10 = +3(dec) / 0011 - 0110 = -3(dec)
+3, -3

We see:
Numbers "1", "2", "3", "4" ... = Magic Numbers. :-)

Second ( LOW ) byte of the Full DVD Version:
1. 74, 7>4, "+" next "-"
2. 46, 4<6, "-" next "+"
3. 27, 2<7, "-" next "+"
4. 83, 8>3, "+" next "-"

FOR CHECK ALL
Please TRY
"-" "+" scheme
and
"+" "-" scheme

[ If Low Byte 11 or 22 or 33 ... ? :-) ]

But for Algorithm need Invert !
7>4, sign "-" next sign "+"

Algorithm:

DVD = 274
We see two bytes: 02 and 74
Need SHR 1
274 shr 1 = 137
137 dec to bin = 10001001
High four-bit byte = 1000 = 8(dec)
Low four-bit byte = 1001 = 9(dec)
Second byte ( Low ) of DVD 274 = 74, 7>4,
First sign for digit "-" for high 4-bit byte
Second sign for digit "+" for low 4-bit byte
"Magic Number" = 2 ?
Magic Number = First Number [+/-] Number
Number:= -1, 0, +1 (or may be any)
[
See:
1. "Magic Number" = "First Number" + 1
2. "Magic Number" = "First Number" (for New Car Audio)
3. "Magic Number" = "First Number" - 1 (for Old Car Audio)
But may be depend on DVD Version ?
???
One Byte:
0 .. 127(7F) .. 255(FF)
Function "Signum" ?

DVD Version > 127: Variant 1 [+1]
DVD Version = 127: Variant 2 [0]
DVD Version < 127: Variant 3 [-1]
Please TRY !
]
New High 4-bit byte of Code: abs(8 - 2) = 6 = 110 (bin)
New Low 4-bit byte of Code: abs(9 + 2) = 11 = 1011 (bin)
Concatenate:
110 Concat 1011
1101011 (bin ) = 107 (dec)
And Concatenate "First Digit" for Audio with DVD: "1".
1 Concat 107 = 1107
Magic Number = 2 = "First Digit" + 1
and so on ...

Audio with DVD:
DVD: 0274 Code: 1107 Magic: 2 First: 1
DVD Changer:
DVD: 0146 Code: 0088 Magic: 1 First: 0
Car Audio New Model:
DVD: 0127 Code: 4123 Magic: 4 First: 4
Car Audio Old Model:
DVD: 0083 Code: 4038 Magic: 3 First: 4

For Simple Calculator [ without PC ]

For Example: DVD = 0146
Two Bytes 01 and 46: NEED SHL 1 !
146 SHL 1?
Analog: 146 DIV 2 = 73
[ 146 / 2 = 73 ]
( Discard the Fractional Part ! )
Transfer 73 to BIN or HEX
To HEX (Simple)
73 to HEX = ?
73 / 16 = 4
( Discard the Fractional Part ! )
Remainder = 73 - ( 16 x 4 ) = 9
(It is last digit of the new hex number)
4 / 16 = 0
( Discard the Fractional Part ! )
Remainder = 4 - ( 16 x 0 ) = 4
Stop
73 dec = 49 hex = 4.9 hex
(dot = separator First and Second Number)
P.S.
We write Hex to Dec form: :-)
For Example:
Firts number = 2
Second number = 15
Write: 2.15 (NO 2F)

Next Step:

DVD: 146 next 4<6 Scheme "+ next -"
First Digit = 0
( But Try also 0 .. 9 )
146 > 127, Magic Digit = First + 1 = 0 + 1 = 1
49
First Number = 4
Second Number = 9
(Scheme "+ next -")
4 + 1 = 5
9 - 1 = 8
5.8 Hex to Dec = ?
It is NO 58: Only:
High Digit = 5, Low Digit = 8 !
5.8 Hex = 5x16 + 8 = 88 Dec
OR 088
First Digit = 0
CODE = 0088
:-)

Please send me memo about your good hack results.

Simple routine = Calc Model Code.
Download

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