hello..just got the phone 2 days back..i was on 4.2.2 indian firmware....checked download mode and it said knox 0*0...now i flashed the 4.4.2 firmware downloaded from sammobile via odin and when i recheck knox is gone....!!!!
just said binary and system which changed from official to custom once i rooted it with CF-root method(nothing else was working...saferoot/towelroot etc)..and as i seem to have read that flashing stock rom reverts these back to official...is it true?
and does this mean that my knox firmware phone has been converted to a non-knox one after kit kat upgrade?
please anyone let me know..thanks
Installing a custom recovery will always trip Knox!
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Not if your boatloader is old enough. If you boot into download mode and it doesn't say anything about KNOX you can flash anything that doesn't update your bootloader. I'm keeping my good old MH2 version
- How to view if I've Knox enabled or not? Enter download-mode (Power the device off and then press volume down + home + power, then press volume up if the triangle screen appears) If it says Knox 0x1 instead of 0x0, you tripped knox
- You'll get Knox 0x1 (warranty void) when you flash: custom kernel (which is included in many roms) or custom recovery (Update: @gladson1976 claimed a custom recovery didn't trip Knox at him. But at me it did)
- The device will be functional as before, nothing changes, all apps work etc. (Just at booting recovery or system it says "Set warranty bit, custom recovery" and "Set warranty bit, custom kernel" (depending on if you use a custom kernel or recovery)) info provided by @rpgdev (It's been said though, that Knox related app's will stop working.) (Upate: @fburgos claims that tripping knox caused him signal issues)
Another thing is, that if you've Knox apps still installed, they'll give you a message when giving root rights to apps "there is something wrong with the app", as reported by @Flatric
If you get warnings about applications doing not permitted actions, delete the following files from system/app, or let SuperSU fix it for you.
(Use a root browser app for deleting the files)
(information provided by @arco68 throught @R_a_z_v_a_n , thanks.
- Can I reverse Knox? So far it's impossible, but maybe one day there is a workaround (Update: workaround for Exynos CPU available, but not s4 mini yet. (see at buttom))
- Will there ever be a workaround? Knox uses and eFuse chip according to @rogier666 so there will be probably no workaround.
- I heard that in Europe your warranty will not be void, even if it's Knox 0x1 (no guarantee)
- It's been reported that even flashing a newer stock firmware with Odin could cause Knox active @tinko975(I assume this happens because of Odin update of the recovery and kernel (Use in phone Samsung updater to stay safe)
- Reflashing the firmware doesn't cause KNOX 0x1 as reported by @Gloris, confirmed by @Bullet92
- Many rooting method will enable KNOX too, thanks to @afme89 for the info.
- People claimed that if you flash a certain rom and remove the custom kernel from it and flash it with odin then it doesn't get Knox (because no custom kernel, no custom recovery.)
Knox workaround news:
@masinj claimed claimed to has found a workaround for Exynos CPU (Not S4 mini) Further info about this:
How does Knox work? Because Knox is both in the OS (apps) and in the firmware (bootloader) it works in two ways. The OS components prevent attempts to obtain root access and make rooting with these Knox apps a pain in the butt. Fortunately they can be removed. In the firmware component (bootloader), Knox works to prevent the flashing of custom kernels and recoveries. If you flash a custom rom or custom recovery WHILE on the Knox bootloader, your Knox flag will be tripped and your Warranty Bit will go from 0x0 to 0x1. The Knox bootloader cannot be downgraded to, say, the MD4 bootloader because of special protections built into it. If you attempt to downgrade it, your phone will instantly brick. Info provided by @R_a_z_v_a_n , thanks.
And there is no need and no point to downgrade anything.
It doesn't matter what version of Android anything is in relation to KNOX.
Thanks for clarifying. So every firmware after MH4 is "Knox infected" although it came with Android 4.2.2.
You can find a firmware overview at hand-faq.de where the knox firmware is red marked (unfortunately I am still not allowed to post external links).
But assume you are flashing Kitkat would it be possible to go back to 4.2.2? I read this won't be possible unless you are using a firmware which also has a Knox boot loader like MJ7 to NB3. Am I right?
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