[GUIDE] Extract .rfs files

mopodo · Aug 11, 2010

I came from HTC Hero to the Samsung Galaxy S GT-I9000
So I had never problems with cooking something up, but in the Galaxy I faced .rfs files and a flashing tool I can't use on linux...

So I searched through some boards to find a way to extract the .rfs files here a working guide for the S I9000.

What you need

Linux (tested with Debian testing)

It's pretty simple, execute this commands as root on your computer

SHORT WAY (thanks to mimocan)

Code:

# mount -o loop factory.rfs /some_dir

LOOOONG WAY
Attatch the rfs file to the loop device

Code:

# losetup /dev/loop0 /somedir/factoryfs.rfs

Create a directory to mount the device

Code:

# mkdir /somedir/mnt

Mount the device

Code:

# mount /dev/loop0 /somedir/mnt

the content of the rfs is NOT saved on the sdcard! you have to copy it!

Now you can copy the content from the /sdcard/tmp directory to the sdcard

Code:

# cp -R /somedir/mnt /somedir/factoryfs

hope this is helpful for someone

mimocan · Aug 11, 2010

Code:

#mount -o loop factory.rfs /some_dir

should do the same

psternx · Aug 11, 2010

This works because rfs is based on vfat.
But have you ever tried this on cache.rfs or dbdata.rfs?
The mounted folder is empty. The cache.rfs in my case was around 1.2 mb.

Maybe the 1.2 mb are journaling data rfs uses?

I also tried mounting cache.rfs and dbdata.rfs directly on my sgs without any luck.
Since the phone has built in rfs drivers it should be able to mount it.

mopodo · Aug 12, 2010

psternx said:
This works because rfs is based on vfat.
But have you ever tried this on cache.rfs or dbdata.rfs?
The mounted folder is empty. The cache.rfs in my case was around 1.2 mb.

Maybe the 1.2 mb are journaling data rfs uses?

I also tried mounting cache.rfs and dbdata.rfs directly on my sgs without any luck.
Since the phone has built in rfs drivers it should be able to mount it.

If you open the cache.rfs or dbdata.rfs from a PDA build (tested I900XXJP3) in a hexeditor you will see they are empty, just the headers and a lot of zeros

darksnarfer · Aug 12, 2010

Have you been able to modify something from a rfs file and save it?

Laum · Aug 12, 2010

Actually Cache.rfs file in CSC is a renamed update.zip. At least with a few firmwares I have tried. So just open it with, for example, 7-zip and you can browse the files.

hkfan · Sep 3, 2010

deleted............

bloodrider · Sep 19, 2010

Tried to mount a cache.rfs and got a "Device or resource busy".

Then tried to open it trough MagicISO, and voilá, I got the CSC files I needed

a-son · Oct 3, 2010

Now im into modifying factoryfs.rfs and hoping you can give me some tips.

Alt1
mount -o loop factoryfs.rfs directory & Copy files to a new place and edit them but how to create a .rfs from that point?

Alt2
sudo mount -v -o rw,loop,uid=$UID factoryfs.rfs Directory
Edit the files , umount the .rfs . Mount it again but the the changes are gone.

How do you do it?

Thanks.

ykkfive · Oct 3, 2010

a-son said:
Now im into modifying factoryfs.rfs and hoping you can give me some tips.

Alt1
mount -o loop factoryfs.rfs directory & Copy files to a new place and edit them but how to create a .rfs from that point?

Alt2
sudo mount -v -o rw,loop,uid=$UID factoryfs.rfs Directory
Edit the files , umount the .rfs . Mount it again but the the changes are gone.

How do you do it?

Thanks.

for me, i'll definitelty mod it elsewhere

a-son · Oct 3, 2010

ykk_five said:
for me, i'll definitelty mod it elsewhere

Thanks for answer.
Alt 1 i suppose you mean. But how to create the .rfs ?

KBJ911 · Nov 27, 2010

a-son said:
Thanks for answer.
Alt 1 i suppose you mean. But how to create the .rfs ?

yess!!!!

how to recompile the .rfs ?????

Val3r10 · Dec 17, 2010

KBJ911 said:
yess!!!!

how to recompile the .rfs ?????

BUMP!
Actually some cache.rfs aren't simple renamed zipfiles, as they (i.e. multi-csc) also contains more stuff

So I loopmounted rw the vfat cache.rfs, extracted and modified the contained sec_csc.zip (this one IS an update.zip structured file...)

But when I put it inside, sync, unmount and mount again to verify stuff, I got a corrupted filesystem and a corrupted zip file.

Any clue to successfully modify contents of such .rfs ?

coldflid · Jan 2, 2011

mopodo said:
I came from HTC Hero to the Samsung Galaxy S GT-I9000
So I had never problems with cooking something up, but in the Galaxy I faced .rfs files and a flashing tool I can't use on linux...

So I searched through some boards to find a way to extract the .rfs files here a working guide for the S I9000.

What you need

Linux (tested with Debian testing)

It's pretty simple, execute this commands as root on your computer

SHORT WAY (thanks to mimocan)

Code:

# mount -o loop factory.rfs /some_dir

LOOOONG WAY
Attatch the rfs file to the loop device

Code:

# losetup /dev/loop0 /somedir/factoryfs.rfs

Create a directory to mount the device

Code:

# mkdir /somedir/mnt

Mount the device

Code:

# mount /dev/loop0 /somedir/mnt

the content of the rfs is NOT saved on the sdcard! you have to copy it!

Now you can copy the content from the /sdcard/tmp directory to the sdcard

Code:

# cp -R /somedir/mnt /somedir/factoryfs

hope this is helpful for someone

Is there a way to convert it back to rfs?

criskelo · Jan 4, 2011

@all
Is there a way to convert it back to rfs?

lownoise · Jan 4, 2011

criskelo said:
@all
Is there a way to convert it back to rfs?

If you used the shortway # mount -o loop factory.rfs /some_dir
than you can modify the files in some_dir.
when finished simple un mount the some_dir and the files are saved in the factory.rfs
Then tar and md5 the factory.rfs and you can flash it with odin

tedgy · Jan 4, 2011

in windows use "magiciso" to extract .rfs

fastcx · Jan 13, 2011

lownoise said:
Then tar and md5 the factory.rfs and you can flash it with odin

I lost at there, what does that means?

lownoise · Jan 13, 2011

From linux

fastcx said:
I lost at there, what does that means?

From the linux command line you have to use
tar -cf filename.tar factory.rfs
md5sum filename.tar >filename.tar.md5

Bluephantom3 · Feb 12, 2011

If you have extracted it with MagicISO and now just want to create it back to factoryfs.rfs can I do this with Cygwin and what would the command line be?

[GUIDE] Extract .rfs files

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