[Hardware Hacking General] AdamOutler:
I updated my arduino code for those who are using one... This allows a bit more flexibility. Just change the HEXOUTPUT=false to true and it will output the hex characters

/*
Change HEXOUTPUT to true in order to see
hexcodes and their ascii representations.
Change HEXOUTPUT to false in order to see
only ascii output as it was intended
*/
boolean HEXOUTPUT = false;

//begin sketch
String MESSAGE="";
void setup() {
// initialize both serial ports:
Serial.begin(115200);
Serial1.begin(115200);
}

/*
Loop will check if Serial(computer) has anything to
say to the Serial1(device), and then says it. It
also reverses the operation and sends from Serial1 to
Serial. If HEXOUTPUT formatting is requested from
above, it will display output in hex format and at the
end of each line, it will display standard output.
*/

void loop() {
// read from port 1, send to port 0:
if (Serial1.available()) {
if ( HEXOUTPUT ) { //IF we are to display HEX output
int inByte = Serial1.read();
MESSAGE= MESSAGE + " " + (char)inByte;
Serial.print(inByte, HEX);
Serial.print("|");
if ( inByte == 13 ){
Serial.println("");
Serial.print(MESSAGE);
MESSAGE="";
}
} else { // if not hex, then display bytes
Serial.print(Serial1.read(), BYTE);
}
}
// read from port 0, send to port 1:
if (Serial.available()) {
Serial1.print(Serial.read(), BYTE);
}
}

here is the hexoutput from a new phone I just received today direct from the factory

0|A|D|
s e t t i n g p a r a m . b o a r d _ r e v = 0
53|65|74|20|63|70|75|20|63|6C|6B|2E|20|66|72|6F|6D|20|34|30|30|4D|48|7A|20|74|6F|20|38|30|30|4D|48|7A|2E|A|D|
S e t c p u c l k . f r o m 4 0 0 M H z t o 8 0 0 M H z .
4F|4D|3D|30|78|39|2C|20|64|65|76|69|63|65|3D|4F|6E|65|6E|61|6E|64|4D|75|78|28|41|75|64|69|29|A|D|
O M = 0 x 9 , d e v i c e = O n e n a n d M u x ( A u d i )
49|52|4F|4D|20|65|2D|66|75|73|65|64|20|2D|20|4E|6F|6E|20|53|65|63|75|72|65|20|42|6F|6F|74|20|56|65|72|73|69|6F|6E|2E|A|D|
I R O M e - f u s e d - N o n S e c u r e B o o t V e r s i o n .
A|D|

2D|2D|2D|2D|2D|2D|2D|2D|2D|2D|2D|2D|2D|2D|2D|2D|2D|2D|2D|2D|2D|2D|2D|2D|2D|61|53|79|61|4C|A|79|29|67|6F|2C|30|D|
- - - - - - - - - - - - - - - - - - - - - - - - - a S y a L
72|41|30|69|65|20|A|2D|2D|2D|2D|2D|2D|3A|30|D| y ) g o , 0
r A 0 i e
3A|20|4E|74|61|72|20|78|30|4D|20|44|78|49|A|20|52|74|66|73|72|5F|62|6D|6C|5F|6C|6F|61|64|5F|70|61|72|74|69|74|69|6F|6E|3A|20|70|69|2D|3E|6E|4E|75|6D|4F|66|50|61|72|74|45|6E|74|72|79|20|3D|A|6E|20|62|74|6F|64|75|2E|44|6F|6E|65|2E|A|D|
: N t a r x 0 M D x I
R t f s r _ b m l _ l o a d _ p a r t i t i o n : p i - > n N u m O f P a r t E n t r y =
n b t o d u . D o n e .
20|D|
72|65|61|64|20|31|20|75|6E|69|74|73|2E|A|D|
r e a d 1 u n i t s .
3D|3D|3D|3D|20|50|41|52|54|4F|3D|20|4C|29|20|20|52|20|30|46|4E|A|5F|20|3D|3D|3D|3D|3D|20|20|5F|3A|4E|54|34|3D|3D|3D|3D|3D|20|20|28|41|20|4F|78|20|4E|A|49|A|3D|3D|3D|49|20|28|54|3A|30|20|54|4F|20|3D|3D|3D|20|41|A|20|20|29|4E|4F|20|3D|3D|A|
= = = = P A R T O = L ) R 0 F N
_ = = = = = _ : N T 4 = = = = = ( A O x N
I
= = = I ( T : 0 T O = = = A
) N O = =

20|3A|43|30|49|54|34|4E|20|6C|6F|6B|65|5F|69|6E|69|74|3A|20|6A|34|66|73|5F|6F|70|65|6E|20|73|75|63|63|65|73|73|2E|2E|A|D|
: C 0 I T 4 N l o k e _ i n i t : j 4 f s _ o p e n s u c c e s s . .
6C|6F|61|64|5F|6C|66|73|5F|70|61|72|61|6D|65|74|65|72|73|20|76|61|6C|69|63|72|72|65|61|64|70|65|6C|74|A|6C|6F|61|64|20|20|65|30|69|6E|69|74|5F|66|75|65|6C|5F|67|61|75|67|65|3A|20|76|63|65|6C|6C|20|3D|20|34|31|34|31|6D|56|2C|20|73|6F|63|2|
l o a d _ l f s _ p a r a m e t e r s v a l i c r r e a d p e l t
l o a d e 0 i n i t _ f u e l _ g a u g e : v c e l l = 4 1 4 1 m V , s o c
69|6E|69|74|5F|66|75|65|6C|5F|67|61|75|67|65|3A|20|76|63|65|6C|6C|20|3D|20|34|31|34|31|6D|56|2C|20|73|6F|63|20|3D|20|39|32|2C|20|72|63|6F|6D|70|20|3D|20|64|30|31|66|A|D|
i n i t _ f u e l _ g a u g e : v c e l l = 4 1 4 1 m V , s o c = 9 2 , r c o m p = d 0 1 f
72|65|61|64|69|6E|67|20|6E|70|73|20|73|74|61|74|75|73|20|66|69|6C|65|20|69|73|20|73|75|63|63|65|73|73|66|75|6C|6C|79|21|2E|A|D|
r e a d i n g n p s s t a t u s f i l e i s s u c c e s s f u l l y ! .
6E|70|73|20|73|74|61|74|75|73|3D|30|78|35|30|34|64|34|66|34|33|A|D|
n p s s t a t u s = 0 x 5 0 4 d 4 f 4 3
50|4D|49|43|20|30|50|54|20|20|5F|53|32|67|65|76|72|75|20|37|A|70|70|20|65|D|
P M I C 0 P T _ S 2 g e v r u 7
73|20|2D|2D|30|47|45|4E|53|20|63|68|5F|20|74|30|75|61|72|65|70|6E|69|A|44|49|53|50|4C|41|59|5F|50|41|54|48|5F|53|45|4C|5B|4D|44|4E|49|45|20|30|78|31|5D|69|73|20|6F|6E|A|D|
s - - 0 G E N S c h _ t 0 u a r e p n i
D I S P L A Y _ P A T H _ S E L [ M D N I E 0 x 1 ] i s o n
4D|44|4E|49|45|20|73|65|74|74|69|6E|67|20|49|6E|69|74|20|73|74|61|72|74|21|21|A|D|
M D N I E s e t t i n g I n i t s t a r t ! !
76|73|79|6E|63|20|69|6E|74|65|72|72|75|70|74|20|69|73|20|6F|66|66|A|D|
v s y n c i n t e r r u p t i s o f f
76|69|64|65|6F|20|69|6E|74|65|72|72|75|70|74|20|69|73|20|6F|66|66|A|D|
v i d e o i n t e r r u p t i s o f f
5B|66|62|30|5D|20|74|75|72|6E|20|6F|6E|A|D|
[ f b 0 ] t u r n o n
4D|44|4E|49|45|20|73|65|74|74|69|6E|67|20|49|6E|69|D|
A|D| D N I E s e t t i n g I n i

41|75|74|6F|62|6F|6F|74|20|28|30|20|73|65|63|6F|6E|64|73|29|20|69|6E|20|70|72|6F|67|72|65|73|73|2C|20|70|72|65|73|73|20|61|6E|79|20|6B|65|79|20|74|6F|20|73|74|6F|70|20|A|D|
A u t o b o o t ( 0 s e c o n d s ) i n p r o g r e s s , p r e s s a n y k e y t o s t o p
67|65|74|5F|64|65|62|75|67|5F|6C|65|76|65|6C|20|63|75|72|72|65|6E|74|20|64|65|62|75|67|20|6C|65|76|65|6C|20|69|73|20|30|78|35|37|34|66|34|63|34|34|2E|A|D|
g e t _ d e b u g _ l e v e l c u r r e n t d e b u g l e v e l i s 0 x 5 7 4 f 4 c 4 4 .
67|65|74|5F|64|65|62|75|67|5F|6C|65|76|65|6C|20|63|75|72|72|65|6E|74|20|64|65|62|75|67|20|6C|65|76|65|6C|20|37|A|72|62|20|4F|20|65|67|67|41|74|66|64|69|D|
g e t _ d e b u g _ l e v e l c u r r e n t d e b u g l e v e l 7
2E|2E|2E|2E|2E|2E|2E|2E|2E|2E|2E|2E|2E|2E|2E|2E|2E|2E|2E|2E|2E|2E|2E|2E|2E|2E|2E|2E|2E|2E|64|6F|6E|65|A|D| r b O e g g A t f d i
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . d o n e
4B|65|72|6E|65|6C|20|72|65|61|64|20|73|75|63|63|65|73|73|20|66|72|6F|6D|20|6B|65|72|6E|65|6C|20|70|61|72|74|69|74|69|6F|6E|20|6E|6F|2E|36|2C|20|69|64|78|2E|36|2E|A|D|
K e r n e l r e a d s u c c e s s f r o m k e r n e l p a r t i t i o n n o . 6 , i d x . 6 .
73|65|74|74|69|6E|67|20|70|61|72|61|6D|2E|73|65|72|69|61|6C|6E|72|3D|30|78|33|31|33|35|31|31|61|31|20|30|78|66|66|36|33|30|30|65|63|A|D|
s e t t i n g p a r a m . s e r i a l n r = 0 x 3 1 3 5 1 1 a 1 0 x f f 6 3 0 0 e c
73|65|74|74|69|6E|67|20|70|61|72|61|6D|2E|62|6F|61|72|64|5F|72|65|76|3D|30|41|35|6F|6C|53|6E|65|78|30|0|D|
A|42|4F|4F|54|49|4E|47|20|43|4F|4D|50|4C|45|54|45|44|D| d _ r e v = 0 A 5 o l S n e x 0

A| B O O T I N G C O M P L E T E D
CTRL-A Z for help |115200 8N1 | NOR | Minicom 2.5 | VT102 | Offline

The setup for this log was plug it in, start logging. there is no primitave and secondary because the phone was charging already.