ADB backup with empty password

Asked Feb 01 '22 at 20:21

Active Feb 03 '22 at 17:33

Viewed 1,022 times

I have a non-rooted Android 12 device and I am trying to execute a procedure it used to work. I basically used to backup an application DB using the following commands:

Connect phone and grant permission from it
Create a folder and cd on it
adb backup -noapk com.myapp.blabla
Do not input any password
dd if="backup.ab" bs=1 skip=24 > compressed-data
printf "\x1f\x8b\x08\x00\x00\x00\x00\x00"| cat - compressed-data | gunzip -c > result.tar
tar xf lresult.tar

Now for some unknown reason, it looks like I have to type a password if I want to go through. In fact, there are two buttons: "do not back up" and "back up my data". The second one gets available only if you type some letter.

I have googled a lot, but it looks like nobody had this problem.

My version is:

adb --version
Android Debug Bridge
version 1.0.39 Version 1:8.1.0+r23-5ubuntu2
Installed as /usr/lib/android-sdk/platform-tools/adb

edited Feb 03 '22 at 17:33

Andrew T.

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asked Feb 01 '22 at 20:21

canovils

maybe enforced from android 12? set password and use java – alecxs Feb 02 '22 at 00:20
Does this answer your question? Is there a way to look inside and modify an adb backup created file? – alecxs Feb 02 '22 at 00:22
1

Instead of manually fiddling with the backup (that exists in 5 different versions with optional compression and encryption) I would recommend to use Android Backup Extractor tool to convert (unpack) it to a tar file. – Robert Feb 02 '22 at 08:47
thank you for the suggestions guys, I'm going to try them – canovils Feb 02 '22 at 21:19
Ok, i've seen the links. I already saw it in the past, but I had problems in making it work. The only way I succeeded is in fact the method I have told you about. The only problem is the fact that now it requires a password.. no idea why or how to circumvent this – canovils Feb 02 '22 at 21:23
Unfortunately we can't help if password is enforced. abe.jar works fine with password – alecxs Feb 03 '22 at 20:30
what do you mean that the password is enforced? – canovils Feb 03 '22 at 21:46
on other android devices one can leave password blank. not sure that is some change in android 12 or just something special by your OEM – alecxs Feb 04 '22 at 20:41
I've understood.. thank you all for your replies – canovils Feb 04 '22 at 20:57

ADB backup with empty password

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