Dear,
times because many users from different countries or continents themselves are devoid of using a Cyanogenmod? Because often the warriors who are programming the current versions of Android on devices forgotten by companies like Samsung, who think only update the TOP line and when others leave throw them aside?
I am suffering with the same damn TOUCHWIZ and can not use a CM11 4.4.4 for the simple reason that the firmware for my device is not suitable for ROM made for his model because I have a FW MTZ BRAZIL and it only runs second programmers on a FW KPN Netherlands, and I have tested and can not make connection in my firmware at least everything works but the audio is with many problems, both the link as the call. Is it so difficult to test this FW Cyanogenmod and solve these problems instead of insisting on getting another firmware works?
I wanted to be using a CM11 and using almost 100% of what my device has to offer.
I wonder if it's so hard so find a bug of call tone that leaves his voice as if you had swallowed gas Helio, and get the speed of the music player that is is in 1.5x? Or is it easier to provide something that works only on who's programming the ROM device and eager users of that device they turn?
Hello all,
I always root my phones and tablets, unlock bootloaders and install custom roms; but only doing with my ex carrier big red vzw; I finally left and switch over t-mobile.
I was able to unbranded my vzw HTC 10 and now it’s fully unlocked. My question now is for my Samsung tablets:
I was reading and learning about Samsung CSC codes on droidnews site; and it says this:
https://www.**********.com/how-to-change-csc-in-samsung-galaxy-phones/
What’s CSC on Samsung?
CSC is the abbreviated form of “Consumer Software Customization” or “Country Specific Code “. CSC is an essential component of Samsung firmware binaries and it contains customized settings, system configurations, localizations and geo-specific things such as the system language, APN settings, and carrier-branding.
That’s is say, Samsung may release the same model of a phone in a country or region with different CSCs. For example, if you live in the United States and own a Samsung Galaxy phone, the CSC or product code of your device may be one of the following depending on the fact whether it is unlocked, open or carrier branded.
Here is my question:
Is it possible to flash the full t-mobile software (all4 files) and change my vzw tablet to t-mobile?
Like it says above “Samsung may release the same model of a phone in a country or region with different CSCs.”
Original Verizon model SM-T387V
Original T-Mobile model SM-T387T
Thanks
As the title say pretty much it all, i need help with SELinux.
I do not quite understand it's purpose and why it got introduced.
My main problem right now is i cant use some very apps like before (Android 8 or less) since i'm now in Android 11 or more.
Also i've been warned that we cant record our calls now in android since Android 9 ( i may be wrong) but i know that even before you couldn't record normally calls. To bypass it you had to use the loudspeaker and record hands-free. I read somewhere that how the modem firmware was coded wich prevented to record calls both ways and to record normally calls you had to flash the modem firmware...
I live in a jurisdiction that allow to record calls both way and allow recording between two persons being one of them in the discussion, ex: you can't record other people discussion if you're not part of it.
So that's pretty what help i'm looking for and would like to have some help with other things mentioned above.
I have a Motorola Moto One 5G ACE witch custom rom Havoc Os and also an old Samsung Galaxy S4 also with a custom rom.
Thank you.
P.S. Sorry for bad english, it ain't my first language.
SELinux ( Linux ) in the world of Android devices is SEAndroid, it got implemented wiith Android 4.3. Some SELinux concepts aren't implemented in Android, hence we correctly have to speak of SEAndroid.
As part of the Android security model, SEAndroid enforces mandatory access control (MAC) for all processes, even processes running with root/superuser ( AKA su - switch user ) privileges. With SEAndroid, Android can better protect and restrict system services, control access to application data and system logs, reduce the impact of malicious software, and protect users from potential bugs in code on mobile devices.
IMO SEAndroid is somehow comparable to UAC known from Windows OS.
SEAndroid by default operates on the principle of default denial: anything that is not explicitly allowed is denied.
To change SEAndroid permissions on a per app basis Android must be rooted.
More info here:
Protecting Android with more Linux kernel defenses
News and insights on the Android platform, developer tools, and events.
android-developers.googleblog.com
Hey,
Germany is implementing EU-Alert (ETSI TS 102 900 [1]) at the moment and referring to the local News, it is a huge mess [2].
But let's start at the beginning.
CellBroadcast is a core component of each mobile network generation (2G,3G,4G,5G,...) and part of the 3GPP spec. CellBroadcast basically allows the network to send a simple SMS to all mobile phones connected to a specific base station. Thes SMS-CB are sent with a Message Identifier (aka Channel, aka Topic) which gives them a special purpose by convention. e.g. ID / Channel 50 is often used for area related information [3], while channel 207 might broadcast local weather information. Since not all Channels are standardized, there is also the option to broadcast an Index that lists all channels with a description. And since users probably don't want any message broadcasted, users have to subscribe to these channels.
Since decades now, CellBroadcast is also used for public Emergency Warnings. This means that, by definition of a country, a specific channel is used to broadcast Emergency Warnings. Long time ago, in many countries it looks like Channel 919 was used for this purpose. For this to work properly, mobile phones were instructed to subscribe to channel 919 by default and also use a special ringtone (even if muted) to alert such a message.
Later - over 12 years ago - additional channels from 4370-4399 were standardized in ETSI TS 123 041 [4] for public warning systems like CMAS, EU-Alert, KPAS. All using the same channels which is beneficial for global roaming.
Android of course supports these public warning systems specified in ETSI TS 123 041 [4] since at least Android 4.2.2 [5]. And nations that use these systems already, like CMAS in the US, report very high and reliable coverage.
However, referring to German news [2] and government, not many phones that are currently on the market will actually support EU-Alert in Germany, despite already supporting EU-Alert in Netherlands or CMAS in the US.
How is this possible when exactly the same SMS-CB is broadcasted, just in a different country?
Golem [2] says that Samsung and Google already confirmed that EU-Alert is currently not supported in Germany, but updates will be rolled out to recent devices.
This strongly suggests to me that OEMs like Samsung and Google actually added country specific filters/configurations for these public warning systems to their phones without deploying a reasonable fallback. Public warning systems based on ETSI TS 123 041 [4] thus may only work in countries that were known to use these systems when the phone was released.
Isn't this an obvious issue?
Google said, starting with Android 11+ it will be possible to update the CellBroadcastReceiver App via Google Play. So devices with Android 11+ will likely receive an update to support EU-Alert in Germany. For Android 10 and older, OEMs will have to supply updates.
What also confuses me is the fact that all Android Phones I own (Nexus 4 with Android 5, Nexus 5X with Android 8, Pixel 3a with Android 12) here in Germany do actually offer the setting for Emergency Warnings and they are already enabled by default. So I assume they would work? Did Google actually deploy a sane default configuration here already?
But if they did - why isn't it working on ALL Android 11+ Phones already? I'm pretty sure my Pixel 3a uses Googles CellBroadcastReceiver App which is provided through the Play Store. So all Android 11+ phones should already use the exact same App?! Or am I wrong here? So what is this update Google actually needs to provide?
And does this also mean that with Android 11+ OEMs are not allowed / cannot implement their own Emergency Warning CellBroadcastReceiver?
This topic is really confusing to me
Shouldn't it be really simple?
All phones, regardless of the OEM, should have a proper SMS-CB Application which allows you to subscribe to custom channels, view the index, and manage your SMS-CB Messages.
Phones should also be aware of special channels to apply special ringtones etc if needed, but they should have a sane fallbacks!
A phone that knows about NL-Alert and CMAS may call messages on Channel 4370 received in the Netherlands "NL-Alert". But when it receives the same message in Germany, it shouldn't just drop it! It should display it as warning and call it whatever it wants. And if it doesn't know about CMAS / EU-Alert, it should just receive it as regular SMS-CB.
Can't be that hard?
Interestingly enough, Samsung phones allow you to subscribe to custom channels. Google phones do not :/
Should there be a better / more enforced standard, so that a country that wants to implement CMAS/EU-Alert in the future doesn't have to rely on OEMs help?
And finally some technical Questions:
I found zero Apps for Android that would allow me to subscribe to custom CellBroadcast Channels on my Google Android phones. Is this even possible?
Also, is it possible to test these CellBroadcasts somehow? Is it possible to write an App that can inject SMS-CB into the system?
Sorry for the long post, but I think this an important Topic.
Let me know what you think
Do you have experience with these Emergency Warnings already?
[1] https://www.etsi.org/deliver/etsi_ts/102900_102999/102900/
[2] https://www.golem.de/news/cell-broadcast-warum-es-am-warntag-ruhig-bleiben-koennte-2206-165822.html
[3] https://source.android.com/devices/architecture/modular-system/cellbroadcast#channel-50
[4] https://www.etsi.org/deliver/etsi_ts/123000_123099/123041/11.04.00_60/ts_123041v110400p.pdf
[5] https://cs.android.com/android/plat...ternal/telephony/gsm/SmsCbConstants.java;l=58
Hey! I was just researching something about this. Thanks for your detailed post.
I am from Chile and, in my case, my operator had subscriptions to two channels: 919 and 920.
In order to see the Cell Broadcast menu in the Messages app, I had to override a CSC setting (I use a Samsung device), particularly "CarrierFeature_Message_DisableMenuCBMessage") because it seems some Chilean operators ordered Samsung to hide it.
Even then, the Google Cell Broadcast app would not let me modify settings other than test alerts.
In my country these emergency alerts are quite unreliable and are often sent by mistake or to the wrong place (i.e. sending a tsunami alert to an area more than 100 km away from the coast).
Shooting Star Max said:
Hey! I was just researching something about this. Thanks for your detailed post.
I am from Chile and, in my case, my operator had subscriptions to two channels: 919 and 920.
In order to see the Cell Broadcast menu in the Messages app, I had to override a CSC setting (I use a Samsung device), particularly "CarrierFeature_Message_DisableMenuCBMessage") because it seems some Chilean operators ordered Samsung to hide it.
Even then, the Google Cell Broadcast app would not let me modify settings other than test alerts.
In my country these emergency alerts are quite unreliable and are often sent by mistake or to the wrong place (i.e. sending a tsunami alert to an area more than 100 km away from the coast).
Click to expand...
Click to collapse
Can you explain how you disabled this CSC setting and on what samsung phone/os?
You can see Googles/Androids latest default configuration for Chile (MCC 730) here:
https://cs.android.com/android/plat...apps/CellBroadcastReceiver/res/values-mcc730/
The config.xml really has some restrictive features enabled :/
Thanks for your reply!
Please note that all the following information assumes you have rooted your device. It's impossible to override this configuration otherwise.
My device is a Galaxy Note20 Ultra (Exynos version, SM‑N985F) running Android 12, One UI 4.1.
As you might know, Samsung devices include several packages named “CSC”, which define settings according to a sales code matching with a region. For example, a device sold in Chile without a carrier uses the sales code CHO, while one sold by operator Movistar uses the sales code CHT.
In the Galaxy Note20 Ultra, the CSC packages are stored in /optics/config/carriers/single (older Samsung devices might use /omc/).
Once you find the sales code matching with your current configuration, you can grab two files: cscfeature.xml and customer_carrier_feature.json. Taking CHO again as an example, the files would be /optics/config/carriers/single/CHO/conf/system/cscfeature.xml and/optics/config/carriers/single/CHO/conf/system/customer_carrier_feature.json.
These files are encoded, but OmcTextDecoder can take care of that.
In the case of CHO, customer_carrier_feature.json has the value "CarrierFeature_Message_DisableMenuCBMessage":"TRUE", which hides the cell broadcast menu in the stock Messages application. Just replace “TRUE” with “FALSE”, save the file and push it to its location. The next time you reboot your system, it will be applied.
Regarding the link you sent, I think we could get around that configuration by decompiling the GoogleCellBroadcastApp.apk through Apktool, modifying the restrictive values, and then pushing the APK to the device, replacing the original version.
Thank you!
Let me know if you managed to patch your original CellBroadcastReceiver.apk!
I actually tried using Runtime Resource Overlays (RROs) which is described on the official docu about CellBroadcast in Android.
You can find the result here: https://github.com/xsrf/android-de-alert
However, I didn't quite get these RROs. It looked like in Oreo you can use RROs to overlay any resource of any app without any permissions or matching signatures, which is quite a surprise to me?!
On my phones with more recent OS, I get signature mismatch errors and also it looks like apps now have to define what resources can be overlayed ...
Hello.
I have a question about Android preinstalled security certificates. There is possible to view them in system, turning off and on. But unfortunately there even no possible to copy-paste sha and it's fingerprint (maybe it just in particular ui of phone, don't know).
So if iam interested to bulk check all of them for issues/more info/research is there a way by some app or maybe pull them somehow from phone with ADB interface and then import and perform mentioned above tasks in some Windows software/ Linux/web frontend? And then turning off what is not good.
Because for example many of them has expired dates, some of them issued by CA or countries that iam personally have no default trust, etc.
p.s. Iam mentioning a FACTORY STATE OFFICIAL SOFTWARE and firmware phone, Android 12, December 2022 security patch.
Thanks!