May 24, 2012  Some also call this “reading the PSN off the SD card” or reading the product serial number off the SD card. Most phones and much of the software on phones will lock in to the CID number of a SD card. The CID number is a unique card.

(tl;dr – skip to bottom for instructions, see also ) The CID register on SD cards is supposed to be read-only, which means it can be used to lock devices to specific SD cards, preventing the user swapping them out, which is very annoying. This can result in you being stuck with a smaller card than you’d like in a device or not being able to use a backup in case of damage.I’ve spent a while trying to work out how to change the ID on some cards. There is surprisingly little info out there about this, when it’s easy for other devices. For example, if you want to change the supposedly read-only ID on various kinds of RFID tag you can simply buy a special version from China that allows it (often referred to as gold or magic cards). There are rumours of cheap Chinese SD cards that don’t follow the official spec and allow you to change to them – I now have large pile of cheap Chinese SD cards on my desk, but unfortunately none of them did allow it. The spec includes a command (CMD26) for writing the CID, but it’s only supposed to work once in the factory when the card is first assigned an ID.

All the cards I got seemed to honour that restriction. However, there is probably some way to unlock themIf you’ve found this page by looking for help on this topic you’ve probably already seen Bunnie Huang’s SD card hacking presentation, unfortunately I wasn’t able to track down any APPO AX211 based cards, which I thought would be my best bet.In that presentation was mention of vendor commands for a Samsung eMMC used as the built-in storage on an Android phone.

I’m not well enough versed on the technology to know quite what the difference between eMMC and SD cards are, aside from the way SD cards are packaged of course – although that might be all there is to it. Reading around they seem work in the same way and appear the same within Linux. Then I stumbled upon, where Sean Beaupre had managed to unlock a Samsung phone (to developer mode) by reverse engineering some of the eMMC firmware on his device and finding commands that allowed the CID to be unlocked and rewritten.So I started buying Samsung SD cards, hoping for one with the same moviNAND core as the eMMC in their phones. I now also have a stack of Samsung SD cards on my desk, but with the last different one I found I struck gold! (Collecting Samsung cards is more expensive than cheap Chinese ones and it takes some effort to avoid getting fakes.) The Samsung EVO Plus 32GB MicroSDHC card took the commands from SamDunk and let me change the CID.I have taken the SamDunk code and reworked it a little to make it easier to use for SD cards, but all the credit really needs to go to the original author. To use you simply need a rooted Android device with an SD card slot. Copy the evopluscid binary to the device and put it somewhere with a proper Linux file system (not FAT), then apply execute permission to it.

Run the tool and point it to the SD card device e.g. /dev/block/mmcblk1 (you almost certainly do not want to use mmcblk0, that is likely to be the built-in storage on your device). List the /dev/block folder and make sure the device you going to use appears and disappears as you insert and remove the SD card to be sure.

Supply the new CID you want to set on the command line. If you only need to change the card serial number (part of the CID) you can supply the old CID and the new serial number and the new CID will be calculated for you.

I suggest you make a note of the old CID first, in case you want to set it back later. This can be found in the file like /sys/class/mmchost/mmc1/mmc1:0001/cid, but the path may vary, and again make sure you are looking at the right card by checking it disappears when you remove the card.You can find the code here: (compiled binary is in the lib folder).

Use entirely at your own risk. Use only against genuine Samsung Evo Plus cards, anything else is unlikely to work and could be damaged. Even the right card could potentially be damaged!To set a new completely new CID:# Usage:./evopluscid./evopluscid /dev/block/mmcblk1 744a454e2f412020106c6d77470104c3Or to just change the serial number part of the current CID:# Usage:./evopluscid./evopluscid /dev/block/mmcblk1 1b5deb0102a1 12345678Post navigation. Hi Richard, I know this is an old post, just wanted to thank you, as I managed to change the CID on a 64gb Samsung Evo (no plus).Now, I am facing the next challengethe purpose is to update the maps on an rns315, which requires the card to be password locked.As my only way of accessing the card via mmc is through an Android phone, I was wondering if you had taken this project another step ahead or if you know how to do it.I know what password to set, according to my custom cid, but i haven’t found a way of setting it via adb shell i order to lock the card.Thank you!

@modimo @RichardActually that kind of tool already exists using something like a cheap “Blue Pill” STM32 and even it can independently check whether the card supports the back door or not.The fact is that indeed when you have the right cards, that kind of device is by no means indispensable, just as EVOPLUSCID is not even (honestly speaking), simply send the right commands via SPI protocol is the easiest and cleanest way.Even if nowadays Linux can do it without the need for anything else, as Android, Windows nor other kind of OS, that isn’t the better way, IMHO: SPI it is. The device in question isn’t a standalone cid programmer for compatible cards. It’s an sd card sized device that takes a microsd card for storage and passes everything through, except cid requests which it responds to itself. A neat device and on topic.

However the site is just a signup page where you can register your interest in something that isn’t actually available. As such I deemed the post above to be an advertising post to drive traffic to something the guy is planning to sell. Once it’s available and if it’s demonstrated to be good I might well choose to link to it. Hello Richard,firstly thank you for such detailed description how to proceed with CID change. I am happy I’ve found this place!Now referring to the latest Samsung Evo+ cards, I need to inform potential users that new cards purchased in March 2017 do not allow modification of CID. I have tested 3pcs of 32GB (MB-MC32DA/EU) cards and 2pcs of 64GB (MB-MC64DA/EU). All of them were bought from the official distributors of Samsung in Poland.

Currently I am waiting for delivery of another 32GB card purchased via Aliexpress. I do hope this one will finally work as expected.PS. Maybe some of you have such unnecessary card – I would like to buy it or exchange with ones I have. I am open to any suggestions 🙂Best regards,Leszek. Hi, i try to change cid but i have little problem1. It say ‘s to me ioctl: Connection timed outUnlock command failed.2.

If i repeat command then unlock command failed.3. Repeat again then Failed to enter vendor mode.

Genuine Samsung Evo Plus?So what is wrong? All information about card is hereSamsung evoplus 32gboot@ubuntu:/Desktop/evopluscid/jni#./evopluscid /dev/mmcblk0 744a454e2f412020106c6d77470104c3Unlock command failed.root@ubuntu:/Desktop/evopluscid/jni#./evopluscid /dev/mmcblk0 744a454e2f412020106c6d77470104c3Failed to enter vendor mode. Genuine Samsung Evo Plus?root@ubuntu:/Desktop/evopluscid/jni#./evopluscid/dev/mmcblk0 744a454e2f412020106c6d77470104c3Failed to enter vendor mode. Genuine Samsung Evo Plus?root@ubuntu:/Desktop/evopluscid/jni# cat /sys/block/mmcblk0/device/cid1b503010829b5d02010b01root@ubuntu:/Desktop/evopluscid/jni# ls -l /sys/block grep mmclrwxrwxrwx 1 root root 0 Dec 17 20:43 mmcblk0 -./devices/pci00:00:1c.3/0000:04:00.0/rtsxpcisdmmc.0/mmchost/mmc0/mmc0:0001/block/mmcblk0root@ubuntu:/Desktop/evopluscid/jni#. Hello,Thanks for the answer.

I was compiling on raspberry pi and got:evopluscid.c: In function ‘programcid’:evopluscid.c:58:19: warning: cast from pointer to integer of different size -Wpointer-to-int-castidata.dataptr = (u64)cid;^evopluscid.c: In function ‘parseserial’:evopluscid.c:107:7: warning: incompatible implicit declaration of built-in function ‘strlen’if ((strlen(str) 2) && (str0 ‘0’) &&^evopluscid.c: In function ‘main’:evopluscid.c:135:8: warning: incompatible implicit declaration of built-in function ‘strlen’len = strlen(argv2);^is that okay should i ignore it?

What is a micro SD card and can you recover lost information from it?What is an SD card? An SD card or a Security Digital card is one which is going to store additional amounts of information for you. It’s used for mobile devices such as cameras and smart phones, for instance and it’s capable of being a life saver in certain situations.However, the type of SD cards that the majority of phones and other mobile solutions like tablets, for instance, are going to use the so called micro SD card. What is a micro SD card? You might ask.

This is basically a slightly smaller SD card which is going to be about the size of your fingernail. However, unlike their appearance, these little helpers are capable of storing up to several gigabytes of information.It’s hard to answer the question what is the best SD card because it would really depend on the type of solution you need. It’s quite obvious that going with a micro SD one would be necessary if your phone or other solution requires it but that’s not always the case.The same goes for the size of the card. You wouldn’t want to spend a couple of hundred of bucks to get a 120 GB card when in reality you wouldn’t use more than, let’s say 10GB. With this in mind, you would also want to get an answer to the question what is a SD card used for.The SD card is a basic way of transferring information and storing it.

The good thing about it is that it’s a non-volatile solution just like the majority of storage devices and you don’t need power source for it to keep the data. Furthermore, it’s particularly portable and mobile and a regular micro SD card is going to be compatible with a wide range of mobile devices, provided they accept the implementation of a SD card.You’d be surprised to understand that a lot of manufacturers would allow customers to implement a micro SD or a regular SD card.

The reason is pretty obvious – they want to force people into purchasing their highest paid product if they need more space. How to use SD card?To be completely honest, the usage of a SD card is pretty straightforward. In any case, all you need to do is pick out the SD slot from the device that you want to use it with, place the card within that slot and insert it back into the device. Usually the device is going to automatically pick up the signals and it’s going to deploy all the necessary information on its own so there’s really no need for you to do anything.Unfortunately, sometimes SD cards get formatted unexpectedly and it’s in situations of the kind that you would need to make sure you can recover the lost information. There are different tools on the market that you could take a look at.is one of these tools and its functioning so far seems to depict promising results.Steps to Recover Deleted Files from an SD Card. Step 1: Download and install a data recovery softwareThis is obviously the most basic thing that you would need to take care of upon deciding to recover your backup information. You can the software from the.

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Furthermore, you would also have to install it, which is absolutely seamless. Step 2: Connect an SD card to your PCThe next thing that you would want to do is to connect the phone or the camera or basically any device which uses the SD card to your computer. This is going to let us see what’s wrong with the audience and basically everything there is to know about the company. Step 3: Perform the scanningRight after you manage to connect the SD card to your computer, you will need to perform the scan on it.

Disk Drill keeps things particularly comprehensive and takes into considerations your preferences. With this in mind, you can choose between going for a Quick Scan or for a Deep Scan.Quick Scan is usable in situations in which you’ve lost a smaller amount of information and you’ve done so recently. Basically this tool is the less powerful one as it’s not going to perform a complete and thorough background check but it’s capable of revealing recent losses and recovering them effectively. That’s why it’s also a lot faster.Deep Scan, on the other hand, is particularly useful if you need to recover larger amounts of data and you’ve lost them quite some time ago. This is a powerful scanning tool which is going to recover quite a few files.As you can see, the choice is completely situational and you need to decide for yourself which one would be the best at any given time. Step 4: Recover Deleted FilesThis is the last and final step of the process.

All you need to do is take a look at the lists of files which are going to be provided and recover those of them that you need.Keep in mind that some files might actually be corrupted and they might have lost their integrity and eternal structure which is going to render them impossible to recover.So basically that’s the process that you’d have to go through if you use the Disk Drill software. It goes without saying that it’s pretty seamless and easy to use. However, it might help if you have some basic ideas and knowledge on what is an SD card and the specifications around it. This way you can manage everything a bit better.However, it’s also safe to say that the software doesn’t presume any technical knowledge so even if you have nothing to do with computers it’s easy to recover your information through it. Losing information could be detrimental in certain situations and it is software such as Disk Drill that could turn out to be life saving.

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