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Root phone and banking applications. IKO cannot use contactless payments

Htomas 10323 19
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Can a rooted Samsung phone safely use the IKO banking app and contactless payments, or does rooting make it vulnerable to account theft?

Rooting increases risk, and if you want the banking app to work reliably you should return the phone to its original stock state or flash the multi-file firmware [#17995674][#17995596] One reply warned that any software modification creates an opening for an attacker to take control of the device and read banking data such as BLIK codes [#17995479] On Samsung devices, once the Knox flag is tripped, Magisk/MagiskHide may hide root from some apps, but it will not restore the flag to 0x0 or undo the root status for good [#17997149][#17998742] Another user noted that even a non-rooted system still has some hijacking risk, but the forum advice for banking use was still to go back to stock firmware [#17995674]
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  • #1 17995298
    Htomas
    Level 18  
    Posts: 1034
    Rate: 151
    I have a Samsung Galaxy phone that is out of warranty so I did the rooting. However, I cannot use contactless payments in the IKO banking app. I called the PKO hotline and it was confirmed that this will be the case on rooted phones. I read on the internet that banks block contactless payments on rooted phones for security reasons. But there are apps like Magisk that cheat on these banking apps. So, could anyone explain whether a rooted phone is really vulnerable to hacking an account by a hacker? After all, the banking app is launched only when needed and enters the password each time. Besides, there are antivirus programs for Android.
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  • #2 17995479
    actin
    Level 34  
    Posts: 2689
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    Each interference with the soft devices creates gates for a potential thief. Think that such a person can easily take control of the device and, from the level of his computer, run the network later the program and read, for example, the Blik code and then clean your account.
    If there are programs that cheat the application, there is no big obstacle to make one that will take over all information about your device,
  • #3 17995522
    Htomas
    Level 18  
    Posts: 1034
    Rate: 151
    actin wrote:
    Each interference with the soft devices creates gates for a potential thief. Think that such a person can easily take control of the device and, from the level of his computer, run the network later the program and read, for example, the Blik code and then clean your account.
    If there are programs that cheat the application, there is no big obstacle to make one that will take over all information about your device,

    and how can you protect yourself against it?
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  • #4 17995596
    Anonymous
    Level 1  
  • #5 17995674
    nutergsm
    VIP Meritorious for electroda.pl  
    Posts: 8429
    Help: 1031
    Rate: 1658
    Even on a non-rooted system, there is a risk of hijacking your phone. If you want to use the banking application, upload the multi-file firmware.
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  • #6 17996467
    mobista
    Level 35  
    Posts: 3300
    Help: 257
    Rate: 365
    It won't do him any good, because he has a flag on it.
  • #8 17997149
    nutergsm
    VIP Meritorious for electroda.pl  
    Posts: 8429
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    Now installing Magisk won't change anything because the knox flag is already loaded. If you would use Magisk at the very beginning, it would not punch the flag, now it's gone.
  • #9 17998742
    blahfff
    Level 41  
    Posts: 4929
    Help: 1030
    Rate: 1281
    nutergsm wrote:
    Now installing Magisk won't change anything because the knox flag is already loaded. If you would use Magisk at the very beginning, it would not punch the flag, now it's gone.


    What would it change for him if TWRP is required to install Magisk and this, in turn, will make a flag? Magisk allows you to hide the root from the selected application and IKO itself works on a rooted phone and does not display any messages. It is true that I have not checked the contactless payments because I do not use it.

    MagiskHide at some point was able to "cheat" the system and stating that the Knox flag is still 0x0 so it may be worth verifying. Knox's flags cannot be restored to their original state.
  • #10 17999024
    mobista
    Level 35  
    Posts: 3300
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    Rate: 365
    Of course it is possible to remove the flag - as long as the phone still has a warranty.

    There are other tools to cheat Knox, but they don't always work.
  • #11 17999055
    gathor10
    Level 27  
    Posts: 895
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    mobista wrote:
    Of course it is possible to remove the flag - as long as the phone still has a warranty.
    With the stamped flag, the warranty is no longer ...
  • #12 17999095
    blahfff
    Level 41  
    Posts: 4929
    Help: 1030
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    mobista wrote:
    Of course it is possible to remove the flag - as long as the phone still has a warranty.


    Well, yes, by replacing the disc with one with a loaded flag; P If you know any other way, especially for current models, I will gladly know.
  • #13 17999139
    mobista
    Level 35  
    Posts: 3300
    Help: 257
    Rate: 365
    gathor10 wrote:
    mobista wrote:
    Of course it is possible to remove the flag - as long as the phone still has a warranty.
    With the stamped flag, the warranty is no longer ...


    Who said that?
  • #14 17999209
    gathor10
    Level 27  
    Posts: 895
    Help: 100
    Rate: 137
    mobista wrote:
    Who said that?
    Me, check out my profile.

    Added after 33 [minutes]:

    And so aside from that ...
    Htomas wrote:
    I have a Samsung Galaxy phone that has expired ...
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  • #15 18000072
    mobista
    Level 35  
    Posts: 3300
    Help: 257
    Rate: 365
    gathor10 wrote:
    mobista wrote:
    Who said that?
    Me, check out my profile.

    Added after 33 [minutes]:

    And so aside from that ...
    Htomas wrote:
    I have a Samsung Galaxy phone that has expired ...


    Since after the warranty, only the patch remains. But I will not agree with this lack of guarantee with a loaded flag :)
  • #16 18000214
    gathor10
    Level 27  
    Posts: 895
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    mobista wrote:
    But I will not agree with this lack of guarantee with a loaded flag
    Buddy ... I have been working in the Samsung service for many years and I know the terms of the warranty by heart ... Any interference in the OS invalidates the warranty with a small exception, but this is confidential information.
    Root phone and banking applications. IKO cannot use contactless payments
  • #17 18000394
    mobista
    Level 35  
    Posts: 3300
    Help: 257
    Rate: 365
    I am glad, my friend, that you have been working in Samsung for many years - send me a phone with a stamped flag without the service history and I will delete it for you.
  • #18 18000447
    gathor10
    Level 27  
    Posts: 895
    Help: 100
    Rate: 137
    mobista wrote:
    send me a phone with a stamped flag without service history and I will delete it for you.
    Probably by replacing the motherboard and tamping it early, so that you do not have deduction after returning the part ...
  • #19 18000449
    mobista
    Level 35  
    Posts: 3300
    Help: 257
    Rate: 365
    It is important that the desired effect is achieved.
  • #20 18902373
    Htomas
    Level 18  
    Posts: 1034
    Rate: 151
    I don't use mobile payments. And for the future, there will be a lesson that root can irreversibly disable this phone functionality
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Topic summary

✨ Rooting a Samsung Galaxy phone can disable contactless payment functionality in the IKO banking app due to security measures implemented by banks. Users have reported that rooted devices are more vulnerable to hacking, as malicious software can exploit the rooting process. While applications like Magisk can potentially hide root access from banking apps, they may not restore the device's security status if the Knox flag has been triggered. Restoring the phone to its original state is suggested as a solution, but it may not be effective if the Knox flag is already set. Users are advised to consider the risks associated with rooting, especially regarding banking applications and contactless payments.
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FAQ

TL;DR: Rooting trips Samsung’s Knox warranty bit (2 states: 0x0/0x1); “Knox’s flags cannot be restored to their original state.” IKO then blocks contactless, even after unroot. Use a clean, non‑rooted device for payments. [Elektroda, blahfff, post #17998742]

Why it matters: This FAQ helps Samsung Galaxy users who rooted their phone understand why IKO contactless stopped working and what safe, practical options remain.

Quick Facts

Why did IKO contactless stop working after I rooted my Samsung?

PKO/IKO blocks contactless when the device is rooted or fails integrity checks. The hotline confirmed this behavior. Rooting alters system integrity, so the app disables NFC payments even if the app itself still opens. This is by design to reduce fraud risk. [Elektroda, Htomas, post #17995298]

What is the Samsung Knox “warranty bit” (0x0/0x1) and how does it impact banking apps?

Knox Warranty Void is a hardware e‑fuse that tracks device integrity. 0x0 means intact; 0x1 means tripped. Tripping disables trust‑dependent features and signals to apps that the device is not secure. Reflashing firmware does not reset this bit. Banking apps may block sensitive actions when 0x1 is detected. [Knox Warranty Void]

Can I fix IKO contactless by unrooting and reinstalling the app?

Not if Knox is already tripped. The user revoked root and reinstalled IKO, yet contactless still failed. That outcome is typical because the hardware flag remains 0x1. In such cases, only using a device with Knox 0x0 restores contactless. [Elektroda, Htomas, post #17996865]

Will Magisk or MagiskHide make contactless work again?

If Knox is tripped, Magisk cannot change the hardware flag. MagiskHide can hide root from some apps, but installing it often requires TWRP, which trips Knox. “Knox’s flags cannot be restored to their original state.” Thus, contactless usually remains blocked. [Elektroda, blahfff, post #17998742]

Is it possible to remove or reset a tripped Knox flag?

Not by software. Contributors note the only practical route is hardware replacement, like swapping the motherboard, which is rarely economical. Software tools cannot revert a blown e‑fuse. That’s why restoring firmware does not help once 0x1 is set. [Elektroda, blahfff, post #17999095]

Does rooting void my Samsung warranty?

A long‑time Samsung service tech states that OS interference voids warranty, with a narrow internal exception. Practically, assume rooting voids warranty. That matters because service options for a tripped flag become limited or chargeable outside policy. [Elektroda, gathor10, post #18000214]

Is a rooted phone less secure for banking, even with passwords or antivirus?

Yes. Root weakens OS boundaries and allows hidden control by malware. As one expert put it, “Each interference with the soft devices creates gates for a potential thief.” Antivirus cannot restore kernel‑level trust. Banks therefore disable contactless on compromised devices. [Elektroda, actin, post #17995479]

Can an unrooted phone still be at risk?

Yes. Even stock phones can be compromised through vulnerabilities or unsafe apps. A clean, official multi‑file firmware reinstall can improve integrity signals for banking apps, but it is not a cure‑all. Maintain updates and app hygiene. [Elektroda, nutergsm, post #17995674]

Why does IKO open on rooted devices but still block contactless?

The app may run for non‑NFC features, but contactless requires stronger integrity. A user noted IKO ran on a rooted phone without a message, but did not verify NFC payments. Integrity checks for tokenized NFC remain stricter. [Elektroda, blahfff, post #17998742]

How do I check if my Knox flag is tripped?

Power into Download Mode and view the Knox Warranty Void value. 0x0 indicates intact; 0x1 indicates tripped. If 0x1 appears, reflashing stock firmware will not revert it. Plan banking features accordingly. [Knox Warranty Void]

How do I try a clean restore to improve banking app compatibility?

  1. Back up data, then install official, region‑matched multi‑file firmware.
  2. Factory reset to clear residual modifications.
  3. Reinstall IKO from Play Store and re‑enroll. If Knox is 0x1, contactless may still be blocked. [Elektroda, nutergsm, post #17995674]

I flashed stock firmware, but contactless still won’t work. Why?

If Knox is tripped, firmware reinstalls won’t help. One reply stressed that a “flag” blocks success after flashing. The hardware fuse keeps integrity at 0x1, so payments remain disabled. Check your Knox state before further attempts. [Elektroda, mobista, post #17996467]

My phone is out of warranty—what are my options?

Use IKO without contactless, or move payments to a non‑rooted device. The original poster concluded this as a lesson: root can permanently disable this function on that phone. Hardware replacement tends to exceed value on older devices. [Elektroda, Htomas, post #18902373]

Do patches that “cheat” Knox or SafetyNet restore bank trust?

They may mask root to some checks, but they do not change the hardware flag. Banks can still detect compromised integrity through deeper signals. As noted, tools might spoof 0x0, yet the real flag remains 0x1. [Elektroda, blahfff, post #17998742]

What standards make NFC contactless sensitive to device integrity?

Android’s NFC contactless relies on Host‑based Card Emulation, introduced in Android 4.4. HCE requires a trustworthy OS to protect payment tokens, so integrity failures lead to blocking. This is why rooted or flagged devices lose NFC payments. [Host-based Card Emulation]
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