Teach you a simple way to extract the system image from the mobile phone to make a line to save the brick package

In fact, in the process of making the flash package, sometimes there is no official or third-party rescue brick package (wire brush), what should I do?
There are two conventional methods: (here is the conventional method, the way of reading back is not explained)
     1. Card swipe package to wire swipe package
     2. dd command to export partition image (requires ROOT permission) 

Hide the contents of this post

Method 1: Card swipe package transfer line swipe package
Normal card swipe package decompression and open such a file:
 
Actually, it is very simple, refer to Tutorial :
Card swipe package to line swipe package tool, new support for 6.0 and above

, you can generate what you want The required system.img image

Method 
2, dd command to export the partition image (requires ROOT permission) Assuming there is no official card to swipe the package, you can still export it through the dd command, first make sure that your phone has ROOT permission or a third-party recovery
first , if you have ROOT permission, you will be in boot mode. If you have flashed a third-party recovery, you will enter recovery mode.
Then
. Open the CMD command line and enter: ( The actual path of /dev/block/platform/*/*/by-name may be different, you can manually cd to check the exact path )

1. adb shell "ls -l /dev/block/platform/*/*/by-name"

copy code

The query partition path is:

1. lrwxrwxrwx root     root              2014-01-01 09:42 DDR -> /dev/block/mmcblk0p19
   
2. 
   
3. lrwxrwxrwx root     root              2014-01-01 09:42 aboot -> /dev/block/mmcblk0p4
   
4. 
   
5. lrwxrwxrwx root     root              2014-01-01 09:42 abootbak -> /dev/block/mmcblk0p5
   
6. 
   
7. lrwxrwxrwx root     root              2014-01-01 09:42 boot -> /dev/block/mmcblk0p22
   
8. 
   
9. lrwxrwxrwx root     root              2014-01-01 09:42 cache -> /dev/block/mmcblk0p24
   
10. 
    
11. lrwxrwxrwx root     root              2014-01-01 09:42 config -> /dev/block/mmcblk0p28
    
12. 
    
13. lrwxrwxrwx root     root              2014-01-01 09:42 fsc -> /dev/block/mmcblk0p16
    
14. 
    
15. lrwxrwxrwx root     root              2014-01-01 09:42 fsg -> /dev/block/mmcblk0p20
    
16. 
    
17. lrwxrwxrwx root     root              2014-01-01 09:42 hyp -> /dev/block/mmcblk0p10
    
18. 
    
19. lrwxrwxrwx root     root              2014-01-01 09:42 hypbak -> /dev/block/mmcblk0p11
    
20. 
    
21. lrwxrwxrwx root     root              2014-01-01 09:42 keystore -> /dev/block/mmcblk0p27
    
22. 
    
23. lrwxrwxrwx root     root              2014-01-01 09:42 misc -> /dev/block/mmcblk0p15
    
24. 
    
25. lrwxrwxrwx root     root              2014-01-01 09:42 modem -> /dev/block/mmcblk0p1
    
26. 
    
27. lrwxrwxrwx root     root              2014-01-01 09:42 modemst1 -> /dev/block/mmcblk0p13
    
28. 
    
29. lrwxrwxrwx root     root              2014-01-01 09:42 modemst2 -> /dev/block/mmcblk0p14
    
30. 
    
31. lrwxrwxrwx root     root              2014-01-01 09:42 oem -> /dev/block/mmcblk0p29
    
32. 
    
33. lrwxrwxrwx root     root              2014-01-01 09:42 pad -> /dev/block/mmcblk0p12
    
34. 
    
35. lrwxrwxrwx root     root              2014-01-01 09:42 persist -> /dev/block/mmcblk0p25
    
36. 
    
37. lrwxrwxrwx root     root              2014-01-01 09:42 recovery -> /dev/block/mmcblk0p26
    
38. 
    
39. lrwxrwxrwx root     root              2014-01-01 09:42 rpm -> /dev/block/mmcblk0p6
    
40. 
    
41. lrwxrwxrwx root     root              2014-01-01 09:42 rpmbak -> /dev/block/mmcblk0p7
    
42. 
    
43. lrwxrwxrwx root     root              2014-01-01 09:42 sbl1 -> /dev/block/mmcblk0p2
    
44. 
    
45. lrwxrwxrwx root     root              2014-01-01 09:42 sbl1bak -> /dev/block/mmcblk0p3
    
46. 
    
47. lrwxrwxrwx root     root              2014-01-01 09:42 sec -> /dev/block/mmcblk0p21
    
48. 
    
49. lrwxrwxrwx root     root              2014-01-01 09:42 splash -> /dev/block/mmcblk0p18
    
50. 
    
51. lrwxrwxrwx root     root              2014-01-01 09:42 ssd -> /dev/block/mmcblk0p17
    
52. 
    
53. lrwxrwxrwx root     root              2014-01-01 09:42 system -> /dev/block/mmcblk0p23
    
54. 
    
55. lrwxrwxrwx root     root              2014-01-01 09:42 tz -> /dev/block/mmcblk0p8
    
56. 
    
57. lrwxrwxrwx root     root              2014-01-01 09:42 tzbak -> /dev/block/mmcblk0p9
    
58. 
    
59. lrwxrwxrwx root     root              2014-01-01 09:42 userdata -> /dev/block/mmcblk0p30

copy code

Query the partition path of the system partition as /dev/block/mmcblk0p23. If you want to export the system partition, execute the boot status from the command line :

1. adb shell su -c "dd if=/dev/block/mmcblk0p23" of=/sdcard/system.img

copy code

recovery mode:

1. adb shell "dd if=/dev/block/mmcblk0p23" of=/sdcard/system.img

copy code

Finally, the phone selects MTP mode, that is, as long as the computer can recognize your internal storage, you can copy the system.img image file in the phone