Thanks frapeti!
Back to a question I asked in this thread, what exactly is the difference between CP and DD commands? And why is DD better for this procedure while you can just copy paste the folders?
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[SOLVED][Guide] How to backup EFS + Modemfs folders
- Thread starter YMatrix
- Start date
Thanks frapeti!
Back to a question I asked in this thread, what exactly is the difference between CP and DD commands? And why is DD better for this procedure while you can just copy paste the folders?
Sent from my GT-I9070 using Tapatalk 4 Beta
frapeti
Inactive Recognized Developer
dd dump the whole partition, while cp copy separated files / folders
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Not telling you're wrong, just informing. every partition from /dev/block/* can be treated as file.dd deals with block devices while cp works with files.so cp can be used for backing up partition (we have been doing this for ages for my previous device to backup and restore baseband) though dd will convert and copy it to target directory so looks more organized.
Size of efs & modemfs in root folder.
Hi,
I was trying to take backup of these folders, but before that, i thought of having a look at the actual folder in the root for their sizes.
efs = 87 files, 12 folder. total six=ze is 4.84Kb
modemfs = This folder is empty.
Now please tell is if these are normal sizes. If it is normal then how come their backup is 10 & 16 Mb respectively.
Phone - Samsung S Advance 9070
ROM - Pure Vanila V5
Kernel CoCore E6.8
Regards,
Fred
Hi,
I was trying to take backup of these folders, but before that, i thought of having a look at the actual folder in the root for their sizes.
efs = 87 files, 12 folder. total six=ze is 4.84Kb
modemfs = This folder is empty.
Now please tell is if these are normal sizes. If it is normal then how come their backup is 10 & 16 Mb respectively.
Phone - Samsung S Advance 9070
ROM - Pure Vanila V5
Kernel CoCore E6.8
Regards,
Fred
I am surprised that your modemfs folder is empty
As for the folder size vs. backup size, this is because that these folders are actually partitions on the phone. when backing up using DD / CP commands you are backing up the whole partition (even the "empty" bits of data), which is why you get the according sizes (these are the partition's sizes).
modemfs folder size.
Hi,
Thanks for the reply
I checked the modemfs folder again using ES Explorer, i still find it 0 bytes and its working fine. I think we both are using the same ROM.
Prior to flashing this ROM i was using the HarshJelly ROM based on JB DDULP8 with stock Kernel. My device baseband is I9070DDULP8, is this the reason for this discrepancy.
Can i please know what is the size of the actual modemfs on your phone.
Regards,
Fred.
Hi,
Thanks for the reply
I checked the modemfs folder again using ES Explorer, i still find it 0 bytes and its working fine. I think we both are using the same ROM.
Prior to flashing this ROM i was using the HarshJelly ROM based on JB DDULP8 with stock Kernel. My device baseband is I9070DDULP8, is this the reason for this discrepancy.
Can i please know what is the size of the actual modemfs on your phone.
Regards,
Fred.
I am surprised that your modemfs folder is empty
As for the folder size vs. backup size, this is because that these folders are actually partitions on the phone. when backing up using DD / CP commands you are backing up the whole partition (even the "empty" bits of data), which is why you get the according sizes (these are the partition's sizes).
I am surprised that your modemfs folder is empty
As for the folder size vs. backup size, this is because that these folders are actually partitions on the phone. when backing up using DD / CP commands you are backing up the whole partition (even the "empty" bits of data), which is why you get the according sizes (these are the partition's sizes).
I copied the entire folders efs and modemfs and got only 8kb and 16kb respectively. You sure need 10 n 16mb?
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I don't know why the discrepancy exists, my EFS folder is 8.76 KB, and MODEMFS folder is 10.63 KB.
Maybe @frapeti can shed light on this.
Read the post you quoted:
Yeah that's why I asked. Wondering if I do anything wrong and it won't work when restoring.
Copying the folders in theory should also work, its just safer to back them up using the DD command since you get the original structure, permissions, dates etc. of the partitions.
Thus when restoring its as if you never tampered with them, while the "copy folder" method doesn't give you the original data structure.
Again, it shouldn't make a difference (in theory), but we always like to be closest to the original
Copying the folders in theory should also work, its just safer to back them up using the DD command since you get the original structure, permissions, dates etc. of the partitions.
Thus when restoring its as if you never tampered with them, while the "copy folder" method doesn't give you the original data structure.
Again, it shouldn't make a difference (in theory), but we always like to be closest to the original
I see. Yeah, closest so that we know we did everything correctly.
about size of the back up, theoretically it should be 10 and 16 MB because these partitions are 10 & 16MB resp.I'm still not much familiar with samsung devices so don't know why you modemfs is null
Code:
major minor #blocks name
7 0 24980 loop0
7 1 40572 loop1
7 2 17703 loop2
179 0 15388672 mmcblk0
179 1 16384 mmcblk0p1
179 2 16384 mmcblk0p2
179 3 626688 mmcblk0p3
179 4 313344 mmcblk0p4
179 5 2097152 mmcblk0p5
179 6 1536 mmcblk0p6
179 7 10240 mmcblk0p7
179 8 11859968 mmcblk0p8
179 9 327680 mmcblk0p9
179 10 1024 mmcblk0p10
179 11 51200 mmcblk0p11
179 12 2048 mmcblk0p12
179 13 16384 mmcblk0p13
179 14 2048 mmcblk0p14
179 15 16384 mmcblk0p15
179 16 2048 mmcblk0p16
179 17 16384 mmcblk0p17
179 64 2048 mmcblk0boot1
179 32 2048 mmcblk0boot0
179 96 3866624 mmcblk1
179 97 3862528 mmcblk1p1
254 0 24979 dm-0
254 1 40572 dm-1
254 2 17703 dm-2Gents,
Let me check another S Advance with baseband V I9070DDULP8 and i will get back to you. It seams to me that the folder sizes & its contents are different in diff regions. Even the folder sizes doesn't match on both of your devices.
Thanks both of you for your comments.:victory::good:
Hi,
I just checked another S Advance with the baseband version DDULP8 and it seems that the efs folder is 4.62 KB and the modemfs folder is empty. Now do you guys have any idea why this is so?
Regards,
Fred
Oh, is that stock ddulp8? Cause I use ddulp8 too but I installed cm10.1 on it.
Yes it is Unrooted Stock DDULP8 running jelly bean 4.1.2. Checked these folder sizes using ES Explorer.
Thanks for the post. I did the backup, my 'efs_backup' file size is 10mb and the 'modemfs_backup' is 16mb. Im using the firmware LQG (Italy).
I have one question. When I was in GB I backed up only the 'efs' folder and not with 'dd', but copying it manually from phone to the computer. How to know if it's useful?
I have one question. When I was in GB I backed up only the 'efs' folder and not with 'dd', but copying it manually from phone to the computer. How to know if it's useful?
It's supposed to be useful, but having a DD backup is much safer.
Yes, you can backup to external sd, even good to keep a copy on your pc. By using the DD command the structure is saved.
Sent from my GT-I9070 using Tapatalk 4 Beta
Excellent tutorial. Just one Q though...
These commands through terminal:
$ su
# dd if=/dev/block/mmcblk0p7 of=/sdcard/efs_backup.img
# dd if=/dev/block/mmcblk0p2 of=/sdcard/modemfs_backup.img
# exit
means they must be performed from the phone while it's working (booted), or...?
thx.
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7Hello!
So I recently stumbled upon some information that while flashing all kinds of Roms, you might lose your IMEI, thus being left over with a nice paper weight.
To my understanding this information is stored in the EFS folder (though according to this thread it is actually stored in modemfs).
I googled around and saw many options: PC software, terminal commands, apps etc.
Since each phone utilizes this option in different ways, which would be a good way to backup these folders in case of emergency on the S Advance?
Thanks!
SOLUTION:
These are the commands from the ADB shell, but can also be used within the terminal.
Backup Process:
Code:adb shell su dd if=/dev/block/mmcblk0p7 of=/sdcard/efs_backup.img dd if=/dev/block/mmcblk0p2 of=/sdcard/modemfs_backup.img exit exit adb pull /sdcard/efs_backup.img efs_backup.img adb pull /sdcard/modemfs_backup.img modemfs_backup.img
Restore Backup Process:
Code:adb push efs_backup.img /sdcard/efs_backup.img adb push modemfs_backup.img /sdcard/modemfs_backup.img adb shell su dd if=/sdcard/efs_backup.img of=/dev/block/mmcblk0p7 dd if=/sdcard/modemfs_backup.img of=/dev/block/mmcblk0p2 exit exit
Thanks to @mr.harsh and @KINGbabasula for help and KINGbabasula for making the script!
Please note that the restore commands haven't been tested out, but theoretically its supposed to work.
If someone has made a backup and wiped his EFS folder, he wont mind testing it out3
in the terminal type:
Code:su cp /dev/block/mmcblk0p7 /sdcard/efs_backup cp /dev/block/mmcblk0p2 /sdcard/modemfs_backup
check that efs_backup is 10MB and modemfs_backup is 16MB.And this is for JB.I don't know about GB but most probably they'll be same...2
Copying the folders in theory should also work, its just safer to back them up using the DD command since you get the original structure, permissions, dates etc. of the partitions.
Thus when restoring its as if you never tampered with them, while the "copy folder" method doesn't give you the original data structure.
Again, it shouldn't make a difference (in theory), but we always like to be closest to the original2
I am surprised that your modemfs folder is empty
As for the folder size vs. backup size, this is because that these folders are actually partitions on the phone. when backing up using DD / CP commands you are backing up the whole partition (even the "empty" bits of data), which is why you get the according sizes (these are the partition's sizes).
