Guide for repack

Read this only in github for better view, Repack "may or may not" work with all ROM This guide is not for official or Stock ROM and I don't think I will be able to provide any repack GUIDE for NOUGHT(or try below method if it works)

INFORMATION

If you are using cyanogenmod ROM , you may found something in updateR-script, That is "if range_sha1(........." this executs in script after extraction of system.new.dat to "system partition" , which verifies SAH-1 values of system.new.dat, if values are same, the scripts succeeds and the flashing completes , if not then the script returns "abort("system partition has unexpected non-zero contents after OTA update");" This problem can be solved by changing the old values of system.new.dat with current one and here is how to do it.

NOTE

"if range_sha1(........." a line found in updateR-script of android 6.x ROM's
SHA-1 (Secure Hash Algorithm 1)
system partition partition where your OTA flashes files
If your updateR-script do not contain above lines then don't follow this guide, simply just replace your old files with recently created ones (old-files=system.new.dat, system.transfer.list)

Download these for further need

Extractor.bat
ROM (with file_contexts, or it will be useless)
For nought try to convert file_contexts.bin(binary file) to file_contexts(readable file), for conversion tool search xda
ZIP sign - already included in extractor

Instructions

Sample of "updateR-script" of cyanogenmod ROM (INITIAL) (Note: Removed some lines of script)

if range_sha1("/dev/block/platform/msm_sdcc.1/by-name/system", "36,0,32770,32849,32851,33331,65535,65536,65538,98304,98306,98385,98387,98867,131071,131072,131074,163840,163842,163921,163923,164403,185342,196608,196610,229376,229378,229457,229459,262144,262146,294912,294914,294993,294995,295475,307199") == "0b20303394271424267e36a0ce7573f1b62ddc0d" then

if range_sha1("/dev/block/platform/msm_sdcc.1/by-name/system", "48,32770,32849,32851,33331,65535,65536,65538,66050,97792,98304,98306,98385,98387,98867,131071,131072,131074,131586,163328,163840,163842,163921,163923,164403,185342,185854,196096,196608,196610,197122,228864,229376,229378,229457,229459,229971,261632,262144,262146,262658,294400,294912,294914,294993,294995,295475,307199,307200") == "16902dcea1b74f8c9451cb2245c51465d949ec7e" then

ui_print("Verified the updated system image.");


else
   abort("system partition has unexpected non-zero contents after OTA update");
endif;

As you can see there is "if range_sha1" on the script, see below example-

 
if range_sha1("/dev/block/platform/msm_sdcc.1/by-name/system", "36,0,32770,32849,32851,33331,65535,65536,65538,98304,98306,98385,98387,98867,131071,131072,131074,163840,163842,163921,163923,164403,185342,196608,196610,229376,229378,229457,229459,262144,262146,294912,294914,294993,294995,295475,307199") == "0b20303394271424267e36a0ce7573f1b62ddc0d" then

if range_sha1("/dev/block/platform/msm_sdcc.1/by-name/system", "48,32770,32849,32851,33331,65535,65536,65538,66050,97792,98304,98306,98385,98387,98867,131071,131072,131074,131586,163328,163840,163842,163921,163923,164403,185342,185854,196096,196608,196610,197122,228864,229376,229378,229457,229459,229971,261632,262144,262146,262658,294400,294912,294914,294993,294995,295475,307199,307200") == "16902dcea1b74f8c9451cb2245c51465d949ec7e" then

After .../by-name/system", This line(from "36,.....to 307199") was also found in system.trasfer.list of the same ROM

  "36,0,32770,32849,32851..........294995,295475,307199") == "0b20303394271424267e36a0ce7573f1b62ddc0d" then
  
  "48,32770,32849,32851,..........,295475,307199,307200") == "16902dcea1b74f8c9451cb2245c51465d949ec7e" then

Also line
```
"0b20303394271424267e36a0ce7573f1b62ddc0d" 
```
is equal to SHA-1 value of system.new.dat and
```
"16902dcea1b74f8c9451cb2245c51465d949ec7e"
```
is also equal to SAH-1 value of "same" system.new.dat

(SHA-1 value or Secure Hash Algorithm 1 value)
Frome above there are two different values of SHA-1 of same file and two different SHA-1 value of a "single" file is not possible or I don't know. So either these two values might of different things(files/or maybe numbers).
In system.transfer.list of CM13 ROM, It contains -

3
130069
0
0
new 36,0,32770,32849,32851,33331,65535,65536,65538,98304,98306,98385,98387,98867,131071,131072,131074,163840,163842,163921,163923,164403,185544,196608,196610,229376,229378,229457,229459,262144,262146,294912,294914,294993,294995,295475,307199
zero 48,32770,32849,32851,33331,65535,65536,65538,66050,97792,98304,98306,98385,98387,98867,131071,131072,131074,131586,163328,163840,163842,163921,163923,164403,185544,186056,196096,196608,196610,197122,228864,229376,229378,229457,229459,229971,261632,262144,262146,262658,294400,294912,294914,294993,294995,295475,307199,307200
erase 12,66050,97792,131586,163328,186056,196096,197122,228864,229971,261632,262658,294400

You can see here command

	new 36,0,32770,32849,32851.........to the end  
	  
	zero 48,32770,32849,32851,.........to the end

matches range_sha1 of updater-script --------->  ```"36,0,32770,32849,32851,........294995,295475,307199") == "0b20303394271424267e36a0ce7573f1b62ddc0d" then

matches range_sha1 of updater-script --------->  "48,32770,32849,32851,..........,295475,307199,307200") == "16902dcea1b74f8c9451cb2245c51465d949ec7e" then```

(Hope you get it)

So system.transfer.list and updater-script has a link of "SAH-1" and "transfer" commands
Now change this into right, after repack you have three files

   system.new.dat
   system.transfer.list
   "sha1_system.txt" which contains sha1 check of system.new.dat

NOTE:- transfer commands means numbers beside "new" & "zero" in system.transfer.list, refer to xpirit guide

Let's repack ROM

First open Extractor.bat
Choose option "2 Repack system.new.dat"
Choose 1 (manual mode) --> Repack ( file_contexts is required)
Copy your sub folders for example:- addon.d, app, bin, fonts, framework, buile.prop, etc., to system folder (this message will also displayed in extractor).
Then place "file_contexts" beside system folder

Some info. on ROM zip

A "CUSTOM" ROM ZIP CONTAINS


*   system                (FOLDER)
   
*   META-INF              (FOLDER)
   
*   install               (FOLDER)
   
*   system.transfer.list  (FILE)
   
*   system.patch.dat      (FILE)
   
*   system.new.dat        (FILE)
   
*   file_contexts         (FILE)
   
*   boot.img              (FILE)

(In Stock ROM, may be another files are present)

(FOR MARSHMALLOW AN LOLLIPOP) If you unable to find it (file_contexts) in zip file then extract ramdisk from boot.img and look for "file_contexts" inside ramdisk folder (search xda for methods) or try to explore your ROM/device_source

IMP : Do not use other "file_contexts" or dummy "file_contexts" , it can cause device to loop

Hit enter if you have done above
The extractor creates three files as output :-

  system.new.dat
  system.transfer.list
  sha1_system.txt      -->  A new fresh **SHA-1** value of system.new.dat

Now copy system.new.dat & system.transfer.list to ROM folder
Open system.transfer.list :-

In my case it (system.transfer.list) looks like this


1
124680
erase 2,0,129024
new 76,0,32,33,164,539,692,696,13549,13550,14263,14264,14313,14314,14374,14375,14507,14520,14522,14527,14657,14670,14672,14677,14805,14818,14820,14825,16941,16942,32767,32768,32770,32801,32802,33307,36711,36714,42767,42774,42988,42989,50105,50107,50114,50120,50141,50142,50143,50162,52431,52432,55597,55600,65535,65536,65537,66042,89668,89674,93810,93811,97042,97043,97070,97122,98100,98304,98306,98337,98338,98843,98844,100859,128209,128212,129023

This is totally different from old system.transfer.list (FOUND ON START OF THIS GUIDE)
On comparing there is no "zero" command
Now copy line new --> "76,0,32,33,............,128212,129023" from system.transfer.list to updater-script (see below)
Part of updater-script where range_sha1 exists


if range_sha1("/dev/block/platform/msm_sdcc.1/by-name/system", "76,0,32,33,164,539,692,696,13549,13550,14263,14264,14313,14314,14374,14375,14507,14520,14522,14527,14657,14670,14672,14677,14805,14818,14820,14825,16941,16942,32767,32768,32770,32801,32802,33307,36711,36714,42767,42774,42988,42989,50105,50107,50114,50120,50141,50142,50143,50162,52431,52432,55597,55600,65535,65536,65537,66042,89668,89674,93810,93811,97042,97043,97070,97122,98100,98304,98306,98337,98338,98843,98844,100859,128209,128212,129023") == "0b20303394271424267e36a0ce7573f1b62ddc0d" then

if range_sha1("/dev/block/platform/msm_sdcc.1/by-name/system", "76,0,32,33,164,539,692,696,13549,13550,14263,14264,14313,14314,14374,14375,14507,14520,14522,14527,14657,14670,14672,14677,14805,14818,14820,14825,16941,16942,32767,32768,32770,32801,32802,33307,36711,36714,42767,42774,42988,42989,50105,50107,50114,50120,50141,50142,50143,50162,52431,52432,55597,55600,65535,65536,65537,66042,89668,89674,93810,93811,97042,97043,97070,97122,98100,98304,98306,98337,98338,98843,98844,100859,128209,128212,129023") == "16902dcea1b74f8c9451cb2245c51465d949ec7e" then

As you can see above what I have done. I've replaced transfer commands in

if range_sha1("/dev/block/platform/msm_sdcc.1/by-name/system","REPLACED COMMANDS/paste above coiped lines") == "16902dcea1b74f8c9451cb2245c51465d949ec7e" then

Please just replace your system.new.transfer list "new" values with updateR-script "if range_sha1" values

Now just look at this

........,129023") == "0b20303394271424267e36a0ce7573f1b62ddc0d" then

........,129023") == "16902dcea1b74f8c9451cb2245c51465d949ec7e" then

There are two different SHA-1 values (ofc sha1_sums == 0b20303394271424267e36a0ce7573f1b62ddc0d and 16902dcea1b74f8c9451cb2245c51465d949ec7e) "Here we are talking about unmodified updateR-script"

1st--> 0b20303394271424267e36a0ce7573f1b62ddc0d

2nd--> 16902dcea1b74f8c9451cb2245c51465d949ec7e

Now just open "sha1_system.txt" that was generated recently by extractor, inside it you will find something like this


//
// File Checksum Integrity Verifier version 2.05.
//
bdd6a7e1352232b97db4286cc21fdc8ea91d40f7 system.new.dat

Replace this value bdd6a7e1352232b97db4286cc21fdc8ea91d40f7 with old "SHA-1" values,
example/like this :

........,129023") == "bdd6a7e1352232b97db4286cc21fdc8ea91d40f7" then

........,129023") == "bdd6a7e1352232b97db4286cc21fdc8ea91d40f7" then

Both of line must be assigned same SHA-1 value

After above, updater-script script will somewhat looks like this :- (FINAL)

if range_sha1("/dev/block/platform/msm_sdcc.1/by-name/system", "76,0,32,33,164,539,692,696,13549,13550,14263,14264,14313,14314,14374,14375,14507,14520,14522,14527,14657,14670,14672,14677,14805,14818,14820,14825,16941,16942,32767,32768,32770,32801,32802,33307,36711,36714,42767,42774,42988,42989,50105,50107,50114,50120,50141,50142,50143,50162,52431,52432,55597,55600,65535,65536,65537,66042,89668,89674,93810,93811,97042,97043,97070,97122,98100,98304,98306,98337,98338,98843,98844,100859,128209,128212,129023") == "bdd6a7e1352232b97db4286cc21fdc8ea91d40f7" then

if range_sha1("/dev/block/platform/msm_sdcc.1/by-name/system", "76,0,32,33,164,539,692,696,13549,13550,14263,14264,14313,14314,14374,14375,14507,14520,14522,14527,14657,14670,14672,14677,14805,14818,14820,14825,16941,16942,32767,32768,32770,32801,32802,33307,36711,36714,42767,42774,42988,42989,50105,50107,50114,50120,50141,50142,50143,50162,52431,52432,55597,55600,65535,65536,65537,66042,89668,89674,93810,93811,97042,97043,97070,97122,98100,98304,98306,98337,98338,98843,98844,100859,128209,128212,129023") == "bdd6a7e1352232b97db4286cc21fdc8ea91d40f7" then

ui_print("Verified the updated system image.");


else
  abort("system partition has unexpected non-zero contents after OTA update");
endif;


else
  abort("system partition has unexpected contents after OTA update");
endif;

You can clearley point out difference between INITIAL updater-script(see start of guide) and FINAL upater-script (above)
The both "range_sha1" line in INITIAL updateR-script and FINAL updateR-script differs
Also in final script both the "SHA-1" value become equals to each other and their transfer commands values too (refer to xpirit guide for transfer commands)
That's all save updateR-script, repack ROM to ZIP (Use Winrar) and sign xyz_ROM.zip (optional) for official Recovery , for TWRP do not sign the file, disable zip signing from settings of TWRP
Then flash it, and try to wait for 5 minutes to boot (be patience), if works then good to go else retry or :(

I hope though you got it , comment if you need help, or confused in this

NOTE

Please Ignore the grammer or Typos as English is not my native Language!

And yes if you think this method is useless then please don't use it , don't comment , I have tried my best to write this guide for noobs to understand how to edit updater-script. -PEACE, matrixex

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Repack_INFO.md

Repack_INFO.md

Guide for repack

INFORMATION

Download these for further need

Instructions

Let's repack ROM

Some info. on ROM zip

In my case it (system.transfer.list) looks like this

NOTE

Files

Repack_INFO.md

Latest commit

History

Repack_INFO.md

File metadata and controls

Guide for repack

INFORMATION

Download these for further need

Instructions

Let's repack ROM

Some info. on ROM zip

In my case it (system.transfer.list) looks like this

NOTE