Attend XDA's Second Annual Developer Conference, XDA:DevCon 2014!
5,729,095 Members 41,340 Now Online
XDA Developers Android and Mobile Development Forum

[Q] Change bootloader Prestigio pmp3670b

Tip us?
 
aim-high-man-why-not?
Old
#1  
Junior Member - OP
Thanks Meter 0
Posts: 4
Join Date: May 2014
Default [Q] Change bootloader Prestigio pmp3670b

Hi guys.
Trying to hack my device and rewrite its bootloader to make a prototype for my project, but I'm new to this.

I already have root permission on ClockworkMod Android.
Initially I tried to reinstall OS to Android that I build from source code. But device hasn't got fastboot. So I decided to start from the bottom.

Current problem is that I have to locate UART on my device. Can't provide a photo of its board.
http:##s8.postimg.org#rqfzm4pdx#device.jpg

I read some articles about it and have prepared oscilograph and multimeter. But still, need some help.
Processor is AllWinner A13, have found its datasheet. UART RX and TX pins are 151 and 152, 125 and 124, 13 and 12, and I have no idea how to connect to it.

Could you give me some hints or useful links? Maybe some advice, please?
Thanks in advance.
 
aim-high-man-why-not?
Old
#2  
Junior Member - OP
Thanks Meter 0
Posts: 4
Join Date: May 2014
Trying to analyze pins with mutimeter. Do I have to turn on the device?
 
E:V:A
Old
#3  
E:V:A's Avatar
Recognized Developer
Thanks Meter 1696
Posts: 1,297
Join Date: Dec 2011
Location: -∇ϕ
Aaawwh, that's such an ugly board... (Compared to Oppo-7!)

Here's you pic.





You need the correct USB-to-serial cable, like those offered by FTDI R232Vxxx models. But you have to know what voltage to use!
Attached Thumbnails
Click image for larger version

Name:	device.jpg
Views:	123
Size:	193.6 KB
ID:	2732381  
MSM8960 Info, Architecture and Bootloader(s)
El Grande Partition Table Reference
How to talk to the Modem with AT commands

[REF][ServiceMode] How to make your Samsung perform dog tricks
[REF|R&D|RF] RF/Radio properties of Samsung ServiceMode

Want to know when your phone is getting tracked or tapped?

Help us develop the IMSI Catcher / Spy Detector!
(To be part of the EFF & The Guardian Project toolsets.)
_______________________________
If you like what I do, just click THANKS!
Everything I do is free, altruism is the way!
ŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻ
I do not answer support related PM's.

The Following User Says Thank You to E:V:A For This Useful Post: [ Click to Expand ]
 
aim-high-man-why-not?
Old
#4  
Junior Member - OP
Thanks Meter 0
Posts: 4
Join Date: May 2014
Quote:
Originally Posted by E:V:A View Post
You need the correct USB-to-serial cable, like those offered by FTDI R232Vxxx models.
I've got this one too. I've borrowed it from someone, but I don't know how to use it yet.

Quote:
Originally Posted by E:V:A View Post
But you have to know what voltage to use!
I found these four pins strange (in attachment), and checked it with multimeter. Pins from top to bottom 1, 2, 3, 4.
1-2: 3.25V,
1-3: 3.25V,
1-4: 3.25V.

What can I do to be sure than these are right pins before I start soldering?
Attached Thumbnails
Click image for larger version

Name:	device_pins.jpg
Views:	29
Size:	225.9 KB
ID:	2732597  
 
E:V:A
Old
#5  
E:V:A's Avatar
Recognized Developer
Thanks Meter 1696
Posts: 1,297
Join Date: Dec 2011
Location: -∇ϕ
^^ You don't solder anything. You only need GND attached + Rx to probe.
Those pins are probably not UART... No telling. What's on the backside?
MSM8960 Info, Architecture and Bootloader(s)
El Grande Partition Table Reference
How to talk to the Modem with AT commands

[REF][ServiceMode] How to make your Samsung perform dog tricks
[REF|R&D|RF] RF/Radio properties of Samsung ServiceMode

Want to know when your phone is getting tracked or tapped?

Help us develop the IMSI Catcher / Spy Detector!
(To be part of the EFF & The Guardian Project toolsets.)
_______________________________
If you like what I do, just click THANKS!
Everything I do is free, altruism is the way!
ŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻ
I do not answer support related PM's.

 
aim-high-man-why-not?
Old
#6  
Junior Member - OP
Thanks Meter 0
Posts: 4
Join Date: May 2014
Quote:
Originally Posted by E:V:A View Post
What's on the backside?
Attached Thumbnails
Click image for larger version

Name:	image_09_05_14_01_44_1.jpg
Views:	37
Size:	164.1 KB
ID:	2732973  
Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes