Written to mifare, is no longer working, - NFC Hacking

Wrote a simple text record to a mifare classic card, then to remove this I selected "erase tag" in nfc tools pro. The card no longer operates the door controls. Is there anyway I can rectify this? From my Android device.
If not I will go to IT in the morning and get them to sort it.
Would format memory rectify this?
Would 'format memory'

Same problem. Same action. Same software. But One of my 2 door controls is working. The other isnt. Trying to find out why.

Try formatting NDEF in an app such as StartNFCexpert (Android). Then dump the card info back onto it.
Please be aware that this WILL erase the memory on the card. The door access most likely depends on the serial number of the card.
(I am aware this is an old post, it seems to be a common problem so I thought I would contribute)

Related

Transcend 4GB SD getting corrupt repeatedly..

Hi there,
My transcend 4GB SD card is getting corrupted repeatedly.
It abruptly loses data from any folders and that much space also.(Initial 3.93 GB reduced to 3.7 GB even after formatting)
Whenever some files disappear the file explorer notices the loss in MBs but the Resco explorer doesn't as if they still exist but are hidden somewhere.What does that mean?
I have got the card replaced twice but it has happened again and I am fed up.
I didn't swap it,didn't used it while battery was low, never used camera with it yet it is busted.
What is the cause?WM6? ROM?4GB size not meant for Exec?Transcend?
I am getting a new one of NCP anyway, still any explaination is welcome for I really need a 4GB working properly.
kalya said:
What is the cause?WM6? ROM?4GB size not meant for Exec?Transcend?
Click to expand...
Click to collapse
Are you using the latest SPB Backup? If YES, then that is the cause. You probably have it setup doing automatic backup. It is the automatic backup that is faulty. The regular manual backup works fine. It seems the setting for the number of automatic backup corrupts the SD Card. It sometimes can't delete the specified number of backups, and even if you delete it manually it seems some memory was not returned to the SD Card.
---
Ok
Thanks for the suggestion,
I have SPB 1.5.5 but I always use the manual back-up option.
With this card problem I have 'gathered' some info ( not any knowledge ) about the possible causes mentioned here and there,( you people please add your findings also - it may help others )
1. No cause found
2.The card itself may contain actually less space than claimed.
3.Using it on low battery.
4.Using it with a broken/ another card reader.
5.Having more than 2 GB empty space on it while using the camera function.
6.Removing the card while the device is on.
7.Transcend not compatible with Universal.( though I saw many posts regardless the manufacturers)
I am in the first category metioned above.
No motive,
No evidence,
3 murders and counting...
Eagrly waiting for the NCP one.
I can definitely say I don't have any of the above except number 1. The only cause I have is SPB Backup automatic feature. I too am using Transcend 150X 4GB SD Card.
---
Well you should be happy. ;-) I now only have 3.4gb on my 4gb transcend 45x card. (TS4GSDC)
It started with loosing data so I formatted it. Had no option. After that there was only 3.4gb. Even tried transcends own fix-program (Transcend Fix-Capacity 'Toolver' <sic!>), tried partition magic, partition manager and even Win XP partition removing and making a new one.
Even tried 2 partitions, but the sum of them dont exceed 3.4gb anyway.
Seems the card got corrupted somewhere so its impossible to use more than 3.4gb (Or 3466mb to be exact)
It does make me pissed because when you pay for 4096mb you should be able to access all of that.
I doubt it to be a Universal issue... Think its the crappy card!
Think I should return it and maybe go for the 150x (TS4GSD150) but I read that you all have had similar problems with them.
Is there some sort of Low-level formatter that can fix this?
Otherwise I just stick to my 3.4gb and hope that it will not loose data again.
DrBeer said:
I doubt it to be a Universal issue... Think its the crappy card!
Think I should return it and maybe go for the 150x (TS4GSD150) but I read that you all have had similar problems with them.
Click to expand...
Click to collapse
I'd return it. Yours sounds like a definite Card problem. They have Lifetime Warranty anyway. Then go for the 150X.
---
Yeah. You're right. Dont feel like I can trust this card anymore. And that is one thing that is important. We all know how much effort we put into tweaking and filling up a 4gb card... Only to find it looses data.
Takes a whole day to get it right again.
I will return it tomorrow, and chip in some extra cash to get a 150x.
Probably more stable and reliable...
Keep me posted!
DeBeer,
Good luck with the 150x one.I have already returned my third...all 150x.
If it solves your problem please post here,say in a week or so after using it;
If it does not...
RE
FYI, I've a 4GB 150x TRANSCEND SD card and have been using it since the day I bought it.
No problem so far with my WM5. Formatted it with my WinXP
Unless you've a faulty card or a faulty card reader/writer I don't see why you're getting corrupted data.
One thing I can think off is if you're using some kind of auto backup program and removing your card unknowingly at the same time. This can cause your data to be corrupted. Beware that it takes time to save(write) info to your card when using the Universal. Removing the card immediatedly when saving(writing) is in progress is sure to cause data corruption. Leave a few seconds (I would say 10secs) after saving before removal of card
Quote
"It does make me pissed because when you pay for 4096mb you should be able to access all of that"
Not true. When you format a card like you format a harddisk there's some overhead being used so your actual free space is less
thanks
Now this is new( for me ) and valuable information that Universal takes some time to save the data.I WILL take care in the future.Thank you.
Please explain the phenomenon why default file explorer and the Resco explorer read the card differently i.e. file explorer won't show the corrupt folders memory while Resco does (in properties only).
RE
Quote
"Please explain the phenomenon why default file explorer and the Resco explorer read the card differently i.e. file explorer won't show the corrupt folders memory while Resco does (in properties only)"
Can you check the 'Properties' setting like 'Read', 'Hidden' etc
Re. Properties
FOSA,
Very sorry to say,but I never checked those details of the particular folders.Very silly of me.
But my busted card card is still lying at the vendor's so I shall get it back and check what you've suggested.
"Edit--The card is not detected anymore by anything,looks like hardware problem..."
On another forum mamaich says he can use 8GB SDHC with a patch on a Universal
http://forum.xda-developers.com/showthread.php?t=318795&page=2
If it works then...wow, all the best mamaich.

Windows Phone 7 - The filesystem and how it is presented to the user

Windows Phone 7 represents a radical leap in the way the filesystem is presented to the user compared to WinMo. No longer will the user be able to access the true, underlying filesystem in any direct way - the OS will abstract the file system to a single view of all files - making no distinction between files stored on internal flash, or removable storage, or even striped across both similar to RAID0. The file system functions as a Virtual Unified Storage system.
WP7 will support SD cards, but the functionality is different now. The user data is striped across the SD card and the internal storage. This results in functionality similar to RAID0 - if a member disk is pulled from the set, the entire set ceases to function. Similarly, in WP7, if an SD card is pulled from a deployed device, the device will go into a "reduced functionality" mode - where you are only able to make emergency calls. Upon re-inserting the SD, the data is restored and the system functions normally as it would before the card was pulled. If the card or its data is not available (got corrupted, lost, eaten) - The phone must be "hard reset" to restore full functionality and all user data will be lost.
My guess is this was at least partly done as a method to lock down the security of marketplace apps.
I can see some advantages in this, in that it doesn't matter to a user whether it's on the memory card or on device, but will this completely screw up using the device as a USB storage device?
Thanks for the info! Would this have similar benefits of raid0 (increased performance w/sd card)? I guess if you want to upgrade your card it sounds like you'll have to give it a hard reset. That sounds like it could be a bit of an issue for many users. I wonder if, while it may allow support for an sd card, they may eventually only support non-removable cards because of that?
Makes me wonder why bother then? We all know that sd/micro/minis have a tendancy to corrupt after a year or so (depending on use) so surely its bloody pointless??
Just rely on the internal storage like iphone etc.
timmymarsh said:
Makes me wonder why bother then? We all know that sd/micro/minis have a tendancy to corrupt after a year or so (depending on use) so surely its bloody pointless??
Just rely on the internal storage like iphone etc.
Click to expand...
Click to collapse
I'd rather have it user removable such that it can be upgraded\expanded.
Also, if the card isn't constantly removed\inserted and is of a decent quality, then it'll probably last the life of the phone.
timmymarsh said:
Makes me wonder why bother then? We all know that sd/micro/minis have a tendancy to corrupt after a year or so (depending on use) so surely its bloody pointless??
Click to expand...
Click to collapse
I think that this is just a new requirement, and OEMs had been developing devices with SD cards, so it accomodates this fact.
TehPenguin said:
I'd rather have it user removable such that it can be upgraded\expanded.
Also, if the card isn't constantly removed\inserted and is of a decent quality, then it'll probably last the life of the phone.
Click to expand...
Click to collapse
But which is more reliable? built-in memory like iphone or SD cards?
For those of you interested in why they would want to use a MicroSD card inside the device instead of just soldering a flash chip on the board and the issues that can come with MicroSD, here's a great blog post on the topic.
because... of course we can all "simply" solder a flash chip on the PCB...
dazza9075 said:
because... of course we can all "simply" solder a flash chip on the PCB...
Click to expand...
Click to collapse
I was referring to the manufacturers. Read that blog post by a very, very, smart guy (he hacked the original xbox) and it will make sense.
Removable storage??
What do you mean removable storage? Last I heard it was all non removable?
Da_G said:
Windows Phone 7 represents a radical leap in the way the filesystem is presented to the user compared to WinMo. No longer will the user be able to access the true, underlying filesystem in any direct way - the OS will abstract the file system to a single view of all files - making no distinction between files stored on internal flash, or removable storage, or even striped across both similar to RAID0. The file system functions as a Virtual Unified Storage system.
WP7 will support SD cards, but the functionality is different now. The user data is striped across the SD card and the internal storage. This results in functionality similar to RAID0 - if a member disk is pulled from the set, the entire set ceases to function. Similarly, in WP7, if an SD card is pulled from a deployed device, the device will go into a "reduced functionality" mode - where you are only able to make emergency calls. Upon re-inserting the SD, the data is restored and the system functions normally as it would before the card was pulled. If the card or its data is not available (got corrupted, lost, eaten) - The phone must be "hard reset" to restore full functionality and all user data will be lost.
My guess is this was at least partly done as a method to lock down the security of marketplace apps.
Click to expand...
Click to collapse
Hi ..
Im just want to know if My HTC HD2 can run Win Mo 7 ?
Da_G said:
WP7 will support SD cards, but the functionality is different now. The user data is striped across the SD card and the internal storage. This results in functionality similar to RAID0 - if a member disk is pulled from the set, the entire set ceases to function. Similarly, in WP7, if an SD card is pulled from a deployed device, the device will go into a "reduced functionality" mode - where you are only able to make emergency calls. Upon re-inserting the SD, the data is restored and the system functions normally as it would before the card was pulled. If the card or its data is not available (got corrupted, lost, eaten) - The phone must be "hard reset" to restore full functionality and all user data will be lost.
Click to expand...
Click to collapse
Is there anything which indicates how large of an SD card WP7 can use? Apparently initially phones will only come with 8 GB of memory, and that on an internal card. That seems way too small if you wanted to store music and videos.Would it concievably be possible, as soon as you bought the phone, before anything additional is loaded, to pull the card, copy everything to a 32 GB card and reinsert it?
MHC48 said:
Is there anything which indicates how large of an SD card WP7 can use? Apparently initially phones will only come with 8 GB of memory, and that on an internal card. That seems way too small if you wanted to store music and videos.Would it concievably be possible, as soon as you bought the phone, before anything additional is loaded, to pull the card, copy everything to a 32 GB card and reinsert it?
Click to expand...
Click to collapse
8GB is the minimum spec. There will certainly be devices with larger amounts of storage. It should support at least 32GB.
How is this a performance benefit if most consumer SDs are rated Class 2 (i.e dog slow) and many people prefer to be able to swap cards at will? Class 6 cards are usually pretty expensive, and swapping SD cards on-the-fly is not uncommon...
timmymarsh said:
We all know that sd/micro/minis have a tendancy to corrupt after a year or so (depending on use) so surely its bloody pointless??
Click to expand...
Click to collapse
We do? I've never had a flash card go bad.
adamw79 said:
What do you mean removable storage? Last I heard it was all non removable?
Click to expand...
Click to collapse
WM7 phones will have an external storage card slot but it will become apart of the internal drive and not be used in the since of what we currently use it. when an external sd is inserted it is formatted to becomes part of the main internal drive something like a raid system so if you pull out the sd card phone will not boot until you put it back in, and i do believe this is also the same if you replace the card you might have to hard reset to get the phone to work.
A fred has a test device with 40g (8 internal and a 32g SD card)
You can access the filesystem with the "Remote Tools Framework" along with a filesystem plugin that wraps the Sirep services.
The sirep background services must be running on the device. Unfortunately these need to be flashed in or inserted via imageupdate.
Sirep is the sucesssor of rapi. Some tools include wpget, wpput, wprun etc.
Da_G said:
if a member disk is pulled from the set, the entire set ceases to function ......... Upon re-inserting the SD, the data is restored and the system functions normally as it would before the card was pulled. If the card or its data is not available (got corrupted, lost, eaten) - The phone must be "hard reset" to restore full functionality and all user data will be lost.
Click to expand...
Click to collapse
So, that being said.
Whilst Its a well known fact that "external media" such as Micro SD cards will not be user accessable, would it be possible to manually replace the cards?
For example, if a user dared to dismantle his/her device to access the card.
Then remove it, copy the partition on there to a larger piece of media, extend the partition to fill the card & then place that back before re-constructing the rest of the device.
Do you know if that could work, or are there measures put into place which prevent this? I guess some manufacturers may glue cards in, but that can be got around. I mean software wise, would doing this mess up the opperation of the device?
If that wouldnt work, then how about simply replacing the card & doing a hard reset? Any idea if it would simply accomodate the new card?
Im just trying to think of work-arounds as I know many people will be dissapointed with the variety of 8GB devices out there.
cris_rowlands said:
So, that being said.
Whilst Its a well known fact that "external media" such as Micro SD cards will not be user accessable, would it be possible to manually replace the cards?
For example, if a user dared to dismantle his/her device to access the card.
Then remove it, copy the partition on there to a larger piece of media, extend the partition to fill the card & then place that back before re-constructing the rest of the device.
Do you know if that could work, or are there measures put into place which prevent this? I guess some manufacturers may glue cards in, but that can be got around. I mean software wise, would doing this mess up the opperation of the device?
If that wouldnt work, then how about simply replacing the card & doing a hard reset? Any idea if it would simply accomodate the new card?
Im just trying to think of work-arounds as I know many people will be dissapointed with the variety of 8GB devices out there.
Click to expand...
Click to collapse
From what I've heard, the last option there, with forcing a hard reset is likely to be the only one that works, but it should work. OEMs may well glue down the microSD cards though.
I think quite a few devices will be using microSD cards internally, as it lets you release 3 versions of a device with different storage sizes very easily (just slot in an 8GB, 16GB or 32GB uSD card and release it).
I also doubt there will be many only 8GB devices. I know we've only seen leaks of 8GB devices, but it makes sense to test on slightly cheaper hardware, and make sure the OS works on the bare minimum of hardware.

FroYo + ADB App2SD: Goodbye, Kingston microSDHC?

Good eveneing dear community
I realize that FroYo was a major leap forward for quite a few of us, especially those limited in phone storage (I'm talking about Nexus One and Desire owners in particular). However, I think there is something seriously wrong with those App2SD capabilities.
I recently got the impression that moving applications to SD storage is killing SD cards too fast. Just after the first official FroYo OTA, I discovered and used the posibility to force move applications to SD storage using ADB shell. The result was that virtually any application could be moved out of the phone's internal storage. So far, so good.
But considering that we get updates from the market every few hours, SD cards are under much more pressure now than they were designed to, aren't they? I'm saying this, because in the exact same configuration I mentioned above, my cards keep dying. Before the OTA, I bought an expensive class 10 Kingston microSDHC card and the performance was indeed remarkable. However, after the OTA and my ADB stunt, my card would get mounted as read-only every few days now. In addition to that, I can't run any applications on the card anymore and the entire system becomes unstable. Unmounting the card using the Android system settings is not possible and neither is formatting. Instead, my phone would sometimes reboot. At first I thought this was a problem with my Kingston SD.
When I ran some tests and did the same things with the official 4 GB card that shipped with my phone as well as with another 8 GB card that came with an older Nokia phone of mine I realized that it wasn't a problem specific to my Kingston card. All of them showed the exact same behavior. This is not just annoying, it also causes data loss, which in my case is unnacceptable!
Has anybody experienced the same? Is this a problem of Android 2.2 or is it just the way microSDHC works? What, besides mounting said damaged cards in a Laptop in attempt fix, can we do about it?
Thank you for any suggestions.
My next phone must have at least 8 GB of internal storage...
Define "dying".
If by dying you mean Android reports there's something wrong with your card, then more likely the problem is software-related rather than the SD being overused.
I got the "your card is fubar" message from my phone but it was as a result of me damaging the file system with a sketchy file manager app. I put it in my computer, did a scandisk. This found the problem, fixed it, I put it back in my phone, voila, perfect again.
Or your problem might be related to the method you're forcibly moving the apps to your SD card. Since you're doing it with ADB rather than through the operating system itself, it's possible apps are corrupting your card's file system as a result of not realizing where they're located. Just a guess.
In any case, SD cards don't (and won't) die from the sort of use you're describing. What might be harmful is storing frequently-used cache on your SD card, but that's not something that you're doing.
Keep in mind that SD cards are intended to be used in cameras, camcorders, etc, and these things write a lot more frequently and aggressively to the card than a little app storage here and there.
I'm not exactly an expert but I'm definitely what I'd call an enthusiast, and let me tell you with certainty: you really have nothing to worry about. Your problem is most likely a software (or related file system issue) or else caused by a one-in-a-thousand random hardware defect. Android, or more specifically, app to SD, isn't a problem.
Maybe you've heard of solid state drives for computers, these are becoming more common. I use one in fact. They operate using technology similar to SD card storage and if ANYTHING was going to stress these things, it would be running a whole computer off them, temp files and all.
Finally, if you're still a little afraid, let me remind you that in fact your phone itself uses the same kind of flash storage as an SD card. Every phone, MP3 player, and similar device does. So in a sense, if wearing out your storage is a concern for you, isn't it better to wear out a replaceable SD card than your phone's irreplaceable internal storage?
----
So now assuming you trust me that there's nothing to worry about, I would suggest you stop forcibly moving apps to your SD card as a possible long-term solution. If you stop getting card problems, you know what the problem was. Since this means you'll run low on storage, I'd then suggest you install a custom OS that allows you to force-move apps from within Android itself, such as Cyanogenmod.
I've been using this mod since it came out and have had no problems. As mentioned above it must be software related to your phone.
Sent from my HTC Desire
Thank you so much for calming me down. I just got the impression that my cards are toast. However, as long as there is a possibility to fix this using my laptop, I'm on the good side.
I disabled that ADB stunt, let's look what the next few days bring.
Just an idea: if your phone (or the sd slot, for that matter) would be somehow messed up, wouldn't that show the same symptoms? It would even explain why _every_ card acts that way. Maybe it's a bad contact in the slot, who knows...

[Q] Copy NFC tag to another NFC tag

Hi everyone, this has probably been asked before but I didn't want to i guess bump a necro thread.
Basically I was wondering is it possible for me to copy an nfc tag to another nfc tag. From a post I saw here, it said it is possible as long as the tag isn't encrypted.
So basically what i was hoping to know is one how would be the best way I would know if its encrypted and two what would be the easiest way to do this.
If it helps my mindset is basically I want to copy the NFC tag from my bus card onto a wristband so that I don't need to use the card anymore. What I'm guessing is that everything is set electronically in terms of card cost and stuff like that as I read that I can recharge and view my balance online so I'm assuming the card just acts like a connecter to your specific account and doesn't actually contain any money information on it.
I tried an app to read from the card and it did show me what I think is numerous files, in which the one I saw said that I was allowed to read from the device but no write access which I'm guessing is fine since all I want to do is read and copy from that NFC tag and then write it to another one I can buy.
The other thing I could do is just cut up my bus card and get the nfc part and place it under a watch or something, the bus company said I can get a new card for free whenever I like if I lose my current one so that's another way but seems a bit crude to me.
eitherrideordie said:
Basically I was wondering is it possible for me to copy an nfc tag to another nfc tag. From a post I saw here, it said it is possible as long as the tag isn't encrypted.
Click to expand...
Click to collapse
You can copy any information you can actually read. BUT the following is not working:
If it helps my mindset is basically I want to copy the NFC tag from my bus card onto a wristband so that I don't need to use the card anymore. What I'm guessing is that everything is set electronically in terms of card cost and stuff like that as I read that I can recharge and view my balance online so I'm assuming the card just acts like a connecter to your specific account and doesn't actually contain any money information on it.
Click to expand...
Click to collapse
Wrong assumption. A card used for banking etc has a private key on it that the bank will use to authenticate you. In order to do this they let the card sign some data and verifies the signature. If everyone could read that key, that would be horrible unsafe. Everybody that would be able to read the key could sign the data on your behalf. That is why the key is on the card and never leaves it.
I tried an app to read from the card and it did show me what I think is numerous files, in which the one I saw said that I was allowed to read from the device but no write access which I'm guessing is fine since all I want to do is read and copy from that NFC tag and then write it to another one I can buy.
Click to expand...
Click to collapse
As I said above, this works for cards that contain only data. You can copy any data that is readable, but cards that give you the functionality you want are not copyable via nfc.
The other thing I could do is just cut up my bus card and get the nfc part and place it under a watch or something, the bus company said I can get a new card for free whenever I like if I lose my current one so that's another way but seems a bit crude to me.
Click to expand...
Click to collapse
Same as above. Id guess your buscard is some sort of mifare card. You can only read/write those if you have the keys. And I don't think you will have them. Well it depends on the exact card but still.
Damastus said:
You can copy any information you can actually read. BUT the following is not working:
Wrong assumption. A card used for banking etc has a private key on it that the bank will use to authenticate you. In order to do this they let the card sign some data and verifies the signature. If everyone could read that key, that would be horrible unsafe. Everybody that would be able to read the key could sign the data on your behalf. That is why the key is on the card and never leaves it.
As I said above, this works for cards that contain only data. You can copy any data that is readable, but cards that give you the functionality you want are not copyable via nfc.
Same as above. Id guess your buscard is some sort of mifare card. You can only read/write those if you have the keys. And I don't think you will have them. Well it depends on the exact card but still.
Click to expand...
Click to collapse
I guess I had too much I was hoping would work, but from reading what you said it doesn't sound like it will . I do get that it has a private key, I was just kind of hoping that in this case it wouldn't since the card doesn't really seem like its worth much, such as compared to something like a visa card or something like that.
Each card has a unique number on them written on the back, so I guess I just kind of assumed each number was assigned for each account type thing and if you lost a card they would just change the account with another different number since you can own multiple bus cards, and that would be all I need, but it seems like you are most likely correct. Our buscard only came into affect about a month or two a go, but I'm assuming they probably paid a company of some sort to do it, and if thats the case they probably would have it encrypted either way
Is there still a way I could check? Just in case theres like some sort of miracle and it is only just a basic card type thing? Even though thats most likely wrong?
You can copy any data that is readable, but cards that give you the functionality you want are not copyable via nfc.
Click to expand...
Click to collapse
If this is the case though I guess its impossible
Cheers though
eitherrideordie said:
Is there still a way I could check? Just in case theres like some sort of miracle and it is only just a basic card type thing? Even though thats most likely wrong?
Click to expand...
Click to collapse
You could try to identify the card. Maybe use sth. like NFC TagInfo or ReTAG to see what type of card it is. These TagInfo will also show you whats in the card when its readable. But dont get your hopes too high.
Damastus said:
You could try to identify the card. Maybe use sth. like NFC TagInfo or ReTAG to see what type of card it is. These TagInfo will also show you whats in the card when its readable. But dont get your hopes too high.
Click to expand...
Click to collapse
Hi, thanks heaps, had a go at using NFC TagInfo and this is what I get
Tag information says the tag type is ISO/IEC 14443-4 smart card
mifare desfire evi(mf3ICD2I)
Under the ISO/IEC 14443-4 Smart card part
it talks about the mifare desfire
Within there it says
Key configuration changeable YES
Master Key required for application creation/deletion YES
Master Key required for application directory list NO
Master Key changeable YES
Available Keys KEY 0: Key version 1
Another key configuration says the exact same thing but also says
Key change permissions AUTHENTICATE WITH KEY 0 application master key
And there's a whole heap of files in there, most of which are readable but some say read fail.
From the sound of all this, its starting to not look that good , I'm assuming if there's keys and things that the only way would be to break them and I don't want to do anything against the rules to be honest .

Mifare Classic

I've had issues with all non-stock roms and NFC with my d855. Initially I though that NFC just wasn't working. Turns out that it's just no longer able to read Mifare Classic cards (which it can do with stock).
Any one have any ideas how easy this would be to solve? I'm not afraid of messing about in the kernel or adding additional drivers. Just been a while since I played around with the NFC subsystem
Mods: Not sure if this is the correct subforum for this. Feel free to move if needed
-EDIT
After a bit of playing around, it looks like NFC works fine for a 14443-4 card until I scan a mifare classic card. At this point all NFC stops working until the screen is switched off and back on again. This makes the Type A card start working again. Still no Mifare Classic tho.
Picking though some Logcat logs to see if I can figure anything out.
Exact same issue here with CM12 (Even just did a full install of the newest nightly, with same issue).
With the stock ROM, I could scan cards with the MIFARE Classic Tool no problem. Now, after I cycle the screen on/off, I can repeatably scan a DESFire card, no problem, and Mifare Classic Tool comes up saying so, but the second I try to scan a normal MIFARE Classic card, nothing happens and I can no longer scan the DESFire card anymore until I cycle the screen.
In the Logcat, I can see activity with the MIFARE Classic scan, just have no idea what I'm looking at or what the problem is.
Did you ever find a fix? Anything I can provide to help anyone fix the issue with CM12?

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