[Galaxy S 4 Q&A, Help & Troubleshooting] leijonasisu:
Taking into account what Hawk said in the first post. This is what we know so far.​

1. Upgrading to Samsung firmware XXUD AND ABOVE will upgrade the Bootloader to KNOX Bootloader. This will give an additional 2 lines in download mode about KNOX status. >>See picture below!!<<

No point asking questions about specific softwares and etc. If you got questions about whether or not one of your favourite custom roms has the KNOX Bootloader etc.

go ask in that custom rom's thread!

2. If the KNOX warranty void line says 0x1 then you

cannot

use KNOX software as your device has been flagged as insecure. By this I mean that if your workplace/company supports bring your own device to work for corporate emails etc. and they use KNOX to keep security your device will not allow this.

You are still able to use future Samdung firmware releases with the KNOX flag 0x1

. BUT YOU CANNOT DOWNGRADE!!

3. If the KNOX warranty line says 0x0 KNOX will work. This means that apps like KNOX locker etc,

will work

on your phone!

4. With the new ´KNOX Bootloader you CAN still ROOT your phone, however rooting will trip the knox flag to 0x1.

5. If you are already on a KNOX Bootloader and try to downgrade to earlier Firmware/Bootloader it will set the KNOX flag to 0x1 i.e. void

AND IT WILL FAIL!!!

So don't bother.

6. Once the KNOX flag gets set to 0x1 there is

no way

to set it back. Plus it doesn't look like there might ever be away. If you got problems with Samdung now there is always HTC, or Apple in the future :p

7. Some newer 4.2.2 software that's supplied with the KNOX Bootloader has been repacked by devs to not use the new Bootloader and it all works fine you can still keep up to date.

Probably best

to look in the relevant threads and see for yourself, or ask there. Not in this thread.

8. I've seen people trying the test build of 4.3 touchwiz without the new KNOX Bootloader

but sound and wifi does not work.

9. There seems to be a big question mark as to weather Samdung will allow hardware repairs under warranty with the KNOX 0x1 flag. So far a few people have reported them still repairing the device, but don't hold your breath as it is technically officially void. If you are in the EU, and bought your phone from there you will still always get your warranty if you ROOT the device (but it will still trip the flag)

10. This only seems to affect GT-i9505 (International Galaxy S 4 LTE Variant) at the moment! Though we wouldn't be surprised if it starts to roll out on all Samdung phones in the future. Though seems we got it on the Note 2 also.

11. 4.3 Touchwiz leak rom will not work with custom kernels at the moment.

12. 4.3 Touchwiz leak rom will not work with the old KNOX-free Bootloader

13. Here is a picture of what your Download Mode will look like if you

do have

the KNOX Bootloader:

Longer explanation:

If your KNOX Warranty is 0x1 (void):​

You CAN:

Still flash any Custom (Or Official ROM) that you want

THAT IS NOT A DOWNGRADE!!

This means you can still flash any Custom or Official ROM that still has the KNOX Bootloader (but not ones without it, unless it's specifically a Custom ROM that is still XXUD but was packaged without the KNOX Bootloader.

Still ROOT your device with CF-Root etc or Root de-la-vega (but what is the point, KNOX Warranty will still be 0x1)

Still install any Custom Kernels etc. but bear in mind that 4.3 TouchWiz will not work with Custom Kernel etc. as stated above.

Basically you can still do anything. It's just very

questionable

if your device still has Warranty.

You can NOT:

Flash your device to an older Firmware / Baseband. It will FAIL (AND if you had KNOX Warranty as 0x0 (valid) it will trip to 0x1 (VOID))

Use KNOX apps. Like the KNOX Locker etc. It won't work.

You cannot get updates over OTA or through Samdung Kies.

Sell your device WITH Warranty. Your Warranty (by definition) is void.

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Hopefully this clears a lot up. Maybe I was wrong with something, if so a Mod or Admin can edit my post. Or someone can tell me and I will do it myself.

Please lets keep this on-topic. It seems as if all Off-topic nonsense is getting ignored anyway. So don't waste your time. Read the first post. Read the whole thread (only takes 10 minutes) and then think hard if you should post here or not.

When in doubt. You can always 'try yourself' that's the whoooooole point of these forums.

Peace, blessings and have a nice day. ​