Recover Master Keys for SD-encryption - General Questions and Answers

Hello,
I'm sorry if this question is redundant, but if haven't found (to my own suprise) a satisfying answer anywhere.
I have encrypted my SD card on my Cyrus CS 28, Stock-Android 6.0, unrooted.
After the installation of a new launcher from F-Droid, the touchscreen is not reacting most of the time; even when, I am not even able to unlock the phone. So I would like to factory reset. The Recovery Mode is perfectly accessible and working.
The question is: Is there a way to recover the keys for the SD-card encryption and reinstall them after the factory reset? For example, via the 'Backup user data' option in the recovery mode? The device has still warranty, but I'm afraid people in the support might just reset the phone on the go and wiping the keys.
Thank you very much,
kind regards

Teurox said:
Hello,
I'm sorry if this question is redundant, but if haven't found (to my own suprise) a satisfying answer anywhere.
I have encrypted my SD card on my Cyrus CS 28, Stock-Android 6.0, unrooted.
After the installation of a new launcher from F-Droid, the touchscreen is not reacting most of the time; even when, I am not even able to unlock the phone. So I would like to factory reset. The Recovery Mode is perfectly accessible and working.
The question is: Is there a way to recover the keys for the SD-card encryption and reinstall them after the factory reset? For example, via the 'Backup user data' option in the recovery mode? The device has still warranty, but I'm afraid people in the support might just reset the phone on the go and wiping the keys.
Thank you very much,
kind regards
Click to expand...
Click to collapse
Whats the point of recovering the keys? Safe your stuff, reset the phone and encrypt it again...

did you find out how to back them up ?

Related

[Q] Parental Pin

I have a pin setup on my tf300t in the Parental Lock that came standard on my tablet. I have forgotten the pin, and im wanting to erase all data on my tablet prior to selling. I cant erase all data without putting the parental pin in.
What are my options apart from try to remember the password?
imfromwales said:
I have a pin setup on my tf300t in the Parental Lock that came standard on my tablet. I have forgotten the pin, and im wanting to erase all data on my tablet prior to selling. I cant erase all data without putting the parental pin in.
What are my options apart from try to remember the password?
Click to expand...
Click to collapse
Boot into recovery by holding power + volume down until boots into bootloader menu and select the factory reset using volume buttons. Unless you are rooted with twrp recovery becareful not to format if you have that.
Im stock - not rooted. When i boot into recovery there is no way to select the last option which is wipe. Ive tried using volume up and volume down and also touching the screen but none work...
Ok, i managed to select wipe data, and then it asked me to confirm my choice by pressing volume up, but then rebooted and all of my data is still there!?
imfromwales said:
Ok, i managed to select wipe data, and then it asked me to confirm my choice by pressing volume up, but then rebooted and all of my data is still there!?
Click to expand...
Click to collapse
It it go through the process of factory reset, after selecting wipe data it should then go into recovery where you'd see the android and the blue bar at bottom moving. If it forgone that and just rebooted not sure why it should wipe all data at which you set everything back up. Last thing which not sure if this would work in your case is the reset button under the volume buttons. Should be small hole just stick something in there and reset it. Don't think the password would keep it from wiping data in recovery that's what most people do when they for get it, although that usually for the screen lock but either one wouldn't think it mattered.
If i were you, i would unlock and flash custom recovery (TWRP) and then use that to do a factory wipe, can even wipe your internal SD card as well.
Then when you go to sell it, use "Unlocked" as a positive thing since so many people are bricking their tablets trying to unlock and flash custom recovery you can upsell it saying all the hard work is done just dont screw up during the process xD
Problem with that is, Im using a mac and only done stuff like that on my PC. Im out of the country for another year with no access to a PC...
Can anyone sugest any way I can get around this problem with forgetting the parental pin?
How can i use a mac to instal a custom recovery and then wipe?
Would the reset button wipe the tablet, i cant seem to find the button...

[Q] can you list reasons tablets wont boot?

Hi, I am new to this, but I am learning fast. I have a RCA tablet (rct6378w2) that will not boot. It powers on, but hangs on the RCA splashscreen. I am able to access the recovery system. Wiping the cache and factory reset doesnt seem to fix the problem. Because the tablet powers on and the screen works okay, I feel like there is still hope for the device. I was wondering if someone could list all of the common reasons why a tablet will power on, but not boot into android. Extra credit if you can tell me which possible problems are fixable and which ones are not. Thanks!
jeremyb234 said:
Hi, I am new to this, but I am learning fast. I have a RCA tablet (rct6378w2) that will not boot. It powers on, but hangs on the RCA splashscreen. I am able to access the recovery system. Wiping the cache and factory reset doesnt seem to fix the problem. Because the tablet powers on and the screen works okay, I feel like there is still hope for the device. I was wondering if someone could list all of the common reasons why a tablet will power on, but not boot into android. Extra credit if you can tell me which possible problems are fixable and which ones are not. Thanks!
Click to expand...
Click to collapse
1. ROM is wrong for the tablet
2. Tablet has no ROM installed
These are the issues possible for you as you say you wiped and factory reset the tablet but did you re-install the ROM afterwards ?
TechMinerUK said:
1. ROM is wrong for the tablet
2. Tablet has no ROM installed
These are the issues possible for you as you say you wiped and factory reset the tablet but did you re-install the ROM afterwards ?
Click to expand...
Click to collapse
Thanks for the response. Well, to give clarity as to when the problem began, this is what happened. I was doing normal things on my tablet, and it seemed to lag really bad. As I tried to press the home button once or twice, I saw some strange lines on the screen as it faded (kind of like when a battery dies). Then the device restarted and hung on boot. After rebooting a few times, I then tried to wipe the cache with no success. After this, I did the factory reset. I know that it cannot be the wrong ROM, but I wonder if somehow the files were corrupted or if the storage unit could have failed. Anyways, according to various instructions I have seen online, I thought that doing the factory reset would restore the original factory rom image? Am I incorrect?
jeremyb234 said:
Thanks for the response. Well, to give clarity as to when the problem began, this is what happened. I was doing normal things on my tablet, and it seemed to lag really bad. As I tried to press the home button once or twice, I saw some strange lines on the screen as it faded (kind of like when a battery dies). Then the device restarted and hung on boot. After rebooting a few times, I then tried to wipe the cache with no success. After this, I did the factory reset. I know that it cannot be the wrong ROM, but I wonder if somehow the files were corrupted or if the storage unit could have failed. Anyways, according to various instructions I have seen online, I thought that doing the factory reset would restore the original factory rom image? Am I incorrect?
Click to expand...
Click to collapse
Depends, if it's a custom recovery it could wipe everything
TechMinerUK said:
Depends, if it's a custom recovery it could wipe everything
Click to expand...
Click to collapse
Thanks for the response. I have only used the regular stock recovery that is preloaded on the device (I think it's called Android System Recovery 3e. To my knowledge, I don't believe there are any working custom recoveries for this device. It seems that doing the factory reset is normally the way to go to fix OS issues on this device. However, when the factory reset process is successful (as far as going through the process is concerned), but it does not fix the issue, it makes me wonder if the factory recovery image is corrupt or something. Any ideas? Also, if the device turns on and I can navigate through the recovery options and even use ADB, do you think the hardware is still good? If so, then it would be a software/firmware problem... right?
I would simply like to get the device working. I don't care whether its a stock recovery or custom recovery, stock rom or custom Rom. I just want to use the device again and not have to throw it in the garbage. Do you have any ideas how I can get it going?
One other thing, I just don't understand why it's so difficult to restore a tablet. A PC is ultra easy to fix by using a self-booting recovery disk or a live linux iso. Perhaps someone can explain to me why it seems to be impossible to find a working rom anywhere for this device.
jeremyb234 said:
Thanks for the response. I have only used the regular stock recovery that is preloaded on the device (I think it's called Android System Recovery 3e. To my knowledge, I don't believe there are any working custom recoveries for this device. It seems that doing the factory reset is normally the way to go to fix OS issues on this device. However, when the factory reset process is successful (as far as going through the process is concerned), but it does not fix the issue, it makes me wonder if the factory recovery image is corrupt or something. Any ideas? Also, if the device turns on and I can navigate through the recovery options and even use ADB, do you think the hardware is still good? If so, then it would be a software/firmware problem... right?
I would simply like to get the device working. I don't care whether its a stock recovery or custom recovery, stock rom or custom Rom. I just want to use the device again and not have to throw it in the garbage. Do you have any ideas how I can get it going?
One other thing, I just don't understand why it's so difficult to restore a tablet. A PC is ultra easy to fix by using a self-booting recovery disk or a live linux iso. Perhaps someone can explain to me why it seems to be impossible to find a working rom anywhere for this device.
Click to expand...
Click to collapse
Unfortunatley because it's not a common brand of tablet not many developers are working on creating ROMs for it

[Q] Go Clever Tab R75 Factory Restore

Hi All,
This may not be the correct section for this topic so feel free to move if there is somewhere more appropiate.
I have a GoClever Tab R75, when setting it up i created a new Gmail account and what i considered a secure obsecure password with no recovery options (I know it was stupid).
The device has fully powered down after several weeks and of course i cannot rember the password, I tried the passwords i used on previous devices because they are all simular but tweeked to keep each one fresh. Now there has been too many attempts. Is there a way to do a factory restore, bearing in mind that there is no vilume buttons and the reset button is only a power reset button. I did try flashing the firmware to see if it may lead to a way to access the boot menu to do this but it didn't help and obviously the firmware flash dosn't interfeer with the data partition so the lock is still in place.
I don't know if it will work but i am looking for a micro usb keyboard with a volume button so i can try but don't expect it to work,
Any comments or tips would be appreciated,
Alan

Storage is full but I just did a reset?

Hi,
My nexus 5 died a few weeks ago. Today I got a used motherboard to replace the broken one. Phone went on but still had personal files and a password from the previous owner (which had a cracked screen so he couldn't delete his files I guess). I did a factory reset via the recovery mode. Booted the phone up, logged in with my google account and selected the app backup thingy. So I get into the homescreen but my apps are not installing and I get a message my storage is full and it can't install apps and sync etc.
What's wrong? Did the factory reset fail to delete the files from the previous owner and how can I fix this?
Thanks
There's no such thing as a backup thingy. Learn the correct terms if you want to be understand. You dont state the recovery. Stock? CWM? TWR?. Lets try twr. That has two wipes. Did you tick the box to wipe the SD card?
SENT BY ENTANGLEMENT
zerosum0 said:
There's no such thing as a backup thingy. Learn the correct terms if you want to be understand. You dont state the recovery. Stock? CWM? TWR?. Lets try twr. That has two wipes. Did you tick the box to wipe the SD card?
SENT BY ENTANGLEMENT
Click to expand...
Click to collapse
Hi,
I'm not familiar with rooted android devices so I'm sorry but I don't mean what CWM/TWR is. So I guess it's just stock. I pressed volume and power buttong on boot up, selected recovery mode. Then I pressed the power button and volume up button and I selected wipe data/factory reset. Then the phone turned on just like when you take it out of the box. I logged in with my google account and with backup thingy I meant the option to redownload your apps and widgets like how they used to be on your previous device.
teunko123 said:
Hi,
I'm not familiar with rooted android devices so I'm sorry but I don't mean what CWM/TWR is. So I guess it's just stock. I pressed volume and power buttong on boot up, selected recovery mode. Then I pressed the power button and volume up button and I selected wipe data/factory reset. Then the phone turned on just like when you take it out of the box. I logged in with my google account and with backup thingy I meant the option to redownload your apps and widgets like how they used to be on your previous device.
Click to expand...
Click to collapse
Hi,
Thanks for providing more details about your issue (I guess). xP
Anyways. You need to open http://forum.xda-developers.com/showthread.php?t=2784527 in another tab, read the intro if you want, but you should definitely read post #2, chapters 1 and 4.
zerosum0 said:
There's no such thing as a backup thingy. Learn the correct terms if you want to be understand. You dont state the recovery. Stock? CWM? TWR?. Lets try twr. That has two wipes. Did you tick the box to wipe the SD card?
SENT BY ENTANGLEMENT
Click to expand...
Click to collapse
What an elitist arse, it's pretty clear what the poster meant. By the way understand isn't the same as understood, understand?

After factory reset Google Backup asks for pattern, can't restore

My Redmi Note 8 suddenly stopped accepting my correct pattern lock, so I was forced to reset. It turns out I had Google Backup enabled, which was a happy surprise. However, it asks me for the previous pattern lock of the phone, which it still won't accept. This is incredibly frustrating.
Is there anything I can do to get access to the backup file or be able to use it? Will it get deleted if I don't restore it right now, in the initial setup?
Thank you.
zoey_96 said:
My Redmi Note 8 suddenly stopped accepting my correct pattern lock, so I was forced to reset. It turns out I had Google Backup enabled, which was a happy surprise. However, it asks me for the previous pattern lock of the phone, which it still won't accept. This is incredibly frustrating.
Is there anything I can do to get access to the backup file or be able to use it? Will it get deleted if I don't restore it right now, in the initial setup?
Thank you.
Click to expand...
Click to collapse
Is this a second hand device? It seems that it is linked to another account.
If your device is unlocked, you are rooted and enabled previously USB debugging, you should pull your backup or some other partition.
The initial setup itself can't delete any data.
Interesting. If you did a factory reset with no internet connection would this thrwart it?
Be careful...
Never use bios, screen locks etc because this is what can happen. Ive gotten locked out of a bios before because of data corruption... with disastrous results. Had no lock been enabled nothing would have happen.
Data encryption for data hdds is an even worse idea... don't do it.
SubwayChamp said:
Is this a second hand device? It seems that it is linked to another account.
Click to expand...
Click to collapse
No, I had this phone for almost two years now and bought it new. Three weeks ago I tried to fingerprint unlock it with wet fingers and after several unsuccesful attempts it asked me for the pattern lock, which it didn't accept, even though I know the correct one. I've been trying to find a way to unlock it or make a backup ever since but found no solution, so I decided to reset.
After factory reset from recovery mode, it asked me if I wanted to restore a backup, and although I thought I probably didn't have one, I logged into the google account I used on the phone before the reset. Turns out I did have backup turned on! However, when I went to restore it, it asked me for the lock pattern at the time of the backup creation. Predictably enough, it didn't accept it, which is where I'm stuck now.
SubwayChamp said:
If your device is unlocked, you are rooted and enabled previously USB debugging, you should pull your backup or some other partition.
Click to expand...
Click to collapse
After factory reset, my device is indeed now unlocked. It is not rooted. I had USB Debugging enabled, but my laptop wasn't authorized, which is why in the end I couldn't unlock it or make a backup previously. I tried plugging it into the laptop in it's current state (waiting for the lock pattern to restore my backup) and tried adb, but it can't find my device at all. Previously, it just said unauthorized, so I suppose USB Debugging is now off.
SubwayChamp said:
The initial setup itself can't delete any data.
Click to expand...
Click to collapse
Plugging it into the computer allowed me to use mtp mode and I took a quick look into the files. All of my files are gone, so I'm pretty sure everything got deleted before the setup stage.
blackhawk said:
Interesting. If you did a factory reset with no internet connection would this thrwart it?
Be careful...
Click to expand...
Click to collapse
Sorry, I'm not sure what you mean. Thwart what? I factory reset from recovery mode so I don't think internet connection had any role there, but I did have it on before. And I connected to the wifi before it asked me to log into google.
zoey_96 said:
Sorry, I'm not sure what you mean. Thwart what? I factory reset from recovery mode so I don't think internet connection had any role there, but I did have it on before. And I connected to the wifi before it asked me to log into google.
Click to expand...
Click to collapse
Where's the lock screen code being stored after the factory reset?
In the phone or cloud?
If in the userdata partition it should be wiped.
blackhawk said:
Where's the lock screen code being stored after the factory reset?
In the phone or cloud?
If in the userdata partition it should be wiped.
Click to expand...
Click to collapse
From what I understand, it was used to encrypt the Google backup file, so it will ask for it even if you try to restore it on another device. So I suppose the answer is cloud.
zoey_96 said:
No, I had this phone for almost two years now and bought it new. Three weeks ago I tried to fingerprint unlock it with wet fingers and after several unsuccesful attempts it asked me for the pattern lock, which it didn't accept, even though I know the correct one. I've been trying to find a way to unlock it or make a backup ever since but found no solution, so I decided to reset.
After factory reset from recovery mode, it asked me if I wanted to restore a backup, and although I thought I probably didn't have one, I logged into the google account I used on the phone before the reset. Turns out I did have backup turned on! However, when I went to restore it, it asked me for the lock pattern at the time of the backup creation. Predictably enough, it didn't accept it, which is where I'm stuck now.
After factory reset, my device is indeed now unlocked. It is not rooted. I had USB Debugging enabled, but my laptop wasn't authorized, which is why in the end I couldn't unlock it or make a backup previously. I tried plugging it into the laptop in it's current state (waiting for the lock pattern to restore my backup) and tried adb, but it can't find my device at all. Previously, it just said unauthorized, so I suppose USB Debugging is now off.
Plugging it into the computer allowed me to use mtp mode and I took a quick look into the files. All of my files are gone, so I'm pretty sure everything got deleted before the setup stage.
Sorry, I'm not sure what you mean. Thwart what? I factory reset from recovery mode so I don't think internet connection had any role there, but I did have it on before. And I connected to the wifi before it asked me to log into google.
Click to expand...
Click to collapse
If you did factory reset device, then all is gone.
Regarding the status locked or not I referred to the bootloader, in case it is locked and the USB debugging is not already enabled then you have less chances to recover the device.
You should try flashing the device through EDL mode but old days (in my last RN8) it requires an authorized Mi account.
zoey_96 said:
From what I understand, it was used to encrypt the Google backup file, so it will ask for it even if you try to restore it on another device. So I suppose the answer is cloud.
Click to expand...
Click to collapse
If you can factory reset it now FPR isn't active.
So when it first boots up after the reset if you can shield it from internet access you can disable Google backup Transport and Framework.
I think these are the backup pathways but you'll need to verify this.
If you need that backup data though it a catch 22. Perhaps if you keep the phone powered on until the backup is done and fully disable screen lock before rebooting... you can have your data without the lockout.
I may be mistaken. This is interesting but I'm very glad it's not my experiment!

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