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Knox improvements have a dark side...

Apparently Samsung's getting ready to roll-out the announced N3 Knox improvements (consumer use vs. corporate device management) to the SGS4. One of the new Knox features allows device owners to prevent the wiping of the device in the event it's stolen. That's pretty cool. But apparently there are some pretty big security and permission changes that are being put in place to make it work based on a 9/4 SGS4 update Samsung pushed out. These are the changes from Chainfire the creator of SuperSU and Triangle Away.
SELinux enabled and set to "restrictive"
A more secure bootloader
A new warranty status indicator inside the bootloader
Inability to downgrade once the new bootloader's installed
What does it mean? The N3's locked down pretty tight and not at a carrier's direction. It's too early to say what the long-term impact will be but the devs are working on getting the flexibility that's gone back.
Follow this thread for more info...
http://forum.xda-developers.com/showthread.php?t=2432100
Here's Chainfire's post on G+...
https://plus.google.com/u/0/+Chainfire/posts/5ggu7naWtaW#+Chainfire/posts/5ggu7naWtaW

Yeah,Knox security and locked bootloader is probably going to be a major headache.
Hope there is a permanent solution for this, time will tell
GT-N7105 via Tapatalk 2

I hope someone is going to figure it out. Im stuck with Verizon so if i buy it i don't have the option to buy it unlocked. But I'm not going to knowingly buy a locked device and then whine and complain about not being able to unlock it. Not being unlocked could be a deal breaker for me.
Sent from my XT926 using Tapatalk 4

If thats true, then its a big blow to the dev community

i already preordered mine out of contract. This is really something that concerns me. Coming from the note 1 I really only care about the screen size/ quality/ camera/ and snapdragon 800. i got 15 days to return and this might be the reason why. I find flashing to be fun.(phones and self=) 21 days of pondering after being pretty dam sure on next phone.

Is Knox included by default for all N3? or is it just for business customers?

CLARiiON said:
Is Knox included by default for all N3? or is it just for business customers?
Click to expand...
Click to collapse
I don't know for sure if Samsung has said one way or the other, but from a production standpoint, it would be easier to include it on all phones.
My main concern is that with a locked bootloader, adding a custom recovery is much more difficult. I prefer being able to create my own phone backups and use them as-needed. Android's stock recovery hasn't changed since at least the OG Droid, and therefore lacks this ability. Otherwise, my personal reasons for wanting to flash have significantly reduced since my first Android device.

Devans32 said:
Not being unlocked could be a deal breaker for me. Sent from my XT926 using Tapatalk 4
Click to expand...
Click to collapse
daraj said:
If thats true, then its a big blow to the dev community
Click to expand...
Click to collapse
joverclock said:
This is really something that concerns me. I find flashing to be fun.
Click to expand...
Click to collapse
This is indeed a concern and could be a deal breaker for me too. As joverclock said, I too really enjoy tinkering with my phone and have missed the active development activities with my EVO 4G LTE that I enjoyed with the original EVO.

Dev Edition?
DCLocal said:
This is indeed a concern and could be a deal breaker for me too. As joverclock said, I too really enjoy tinkering with my phone and have missed the active development activities with my EVO 4G LTE that I enjoyed with the original EVO.
Click to expand...
Click to collapse
Them ( CFO Shamwow VZW) selling phones at retail price locked is a joke. Full price I want to do whatever with the phone. vzw s4 seems pretty well locked on the MDK (latest) revision without the possib to odin downgrade.
Any rumors of a dev version ( unlocked bootloader ) in similar way with this?
Not unlocked no note 3 for me. I have preordered i605-note 2 and Adam Outler unlocked it in 7 days ( including ordering the phone). maybe he can help again.
Many thanks
Abe

CLARiiON said:
Is Knox included by default for all N3? or is it just for business customers?
Click to expand...
Click to collapse
It's on my att S4
Sent from my GT-I9505 using XDA Premium 4 mobile app

CLARiiON said:
Is Knox included by default for all N3? or is it just for business customers?
Click to expand...
Click to collapse
Samsung KNOX & Find My Mobile
The new GALAXY Note 3 comes with enhanced privacy and security protection provided by Samsung KNOX. Users can activate Samsung KNOX with ease which allows them to run and store security-sensitive applications and data inside a protected execution environment called “container.” The security inside the container is strengthened by system-level protection of Samsung KNOX against malware and phishing attacks as well as hacking attempts on physical devices when devices are stolen or lost. For instance, important personal pictures or video can be stored in the container with no worries for data leakage due to hacking. In addition, users may choose to store enterprise applications and data such as corporate email, contacts and calendar and allow the IT department to manage the container through EAS (Exchange ActiveSync Server). These features make the GALAXY Note 3 an ideal device for BYOD (Bring-Your-Own-Device to work)
Furthermore, the GALAXY Note 3 is equipped with an improved Find My Mobile feature that allows users to disable the phone when it is stolen or lost. With the enhanced user authentication, the technology prevents stolen mobile phones from being reset to factory settings, and allows users to remotely track or erase the data from their lost or stolen mobile phones.​
A user doesn't have to activate it but the hooks it needs and control over the bootloader it requires will be on every N3. The same hooks and bootloader changes were just pushed out to the SGS4 which is what has their forum up in arms. I'm guessing Knox was inert on consumer SGS4's originally because it required corporate device management s/w to enable it. Now that it's being aimed at consumers it's going to be on all Samsung's devices that can support it. The devs on the SGS4 forum are still trying to understand what the changes mean and how to work around them. It broke all Chainfire's apps (One Click Root, SuperSU, Triangle Away, Mobile Odin) so he's especially keen at addressing Knox's new "features."

Samsung had a big presence here at the Atlanta Airwatch Connect conference. They mention the new Knox capable hardware "burns in on hardware" when it is rooted and cannot be undone.
I'm not enough of a techie to ask them more specifics about how they accomplish this. But thought I would pass it on here so someone smarter than I can valid this claim.
I might just cancel my preorder if this is true.
Sent from my SAMSUNG-SGH-I317 using xda app-developers app

jetjock said:
Samsung had a big presence here at the Atlanta Airwatch Connect conference. They mention the new Knox capable hardware "burns in on hardware" when it is rooted and cannot be undone.
I'm not enough of a techie to ask them more specifics about how they accomplish this. But thought I would pass it on here so someone smarter than I can valid this claim.
I might just cancel my preorder if this is true.
Sent from my SAMSUNG-SGH-I317 using xda app-developers app
Click to expand...
Click to collapse
Yes if this is true I will be getting back form 739 from best buy and giving it to someone else.

We have been lucky with the s4 here in canada..non locked bootloader. The last at&t ota locked theirs down and they have root but thats all.now it seems the international devices are being locked down also.
I hope the CAN version of the N3 continues the no lock trend but I kind of doubt it. I planned or pre ordering but I think ill wait and see first.
I refuse to spend $800 on a device and not be able to do what I want with it.
sent from my S3, S4 or Note2

Samsung is gonna be hurting if they shy away the regular Joe consumer to try and get enterprise customers. I would think consumers outnumber enterprise people but even if not true, Samsung won't get all thebeneterprise with apple, Microsoft and blackberry in the running also. I am hoping for an unlocked USA LTE band compatible with unlocked bootloader. My next phone needs to hold me until 64bit chips makebwaves on android and I think the note3 can do that in the meantime. The note2 probably could but I am smartphone techno nerd and the note 2 will be ancient history to me if I owned it more than 15 months.

Just thought I'd let you all know:
I have the new MH8 firmware on my S4 that has the new locked bootloader and Knox security.
I had no trouble rooting it, installing CWM Recovery and flashing CM10.2. All works fine.
The downside is that once you're on this new bootloader you cannot downgrade stock firmware using Odin.
That's the only limitation I've come across.
I can still flash any custom ROM, any custom Kernel and any custom recovery

@rbiter said:
Samsung is gonna be hurting if they shy away the regular Joe consumer to try and get enterprise customers. I would think consumers outnumber enterprise people but even if not true, Samsung won't get all thebeneterprise with apple, Microsoft and blackberry in the running also. I am hoping for an unlocked USA LTE band compatible with unlocked bootloader. My next phone needs to hold me until 64bit chips makebwaves on android and I think the note3 can do that in the meantime. The note2 probably could but I am smartphone techno nerd and the note 2 will be ancient history to me if I owned it more than 15 months.
Click to expand...
Click to collapse
XDA looks at Knox's impact to customization and shivers. The masses look at it as a safe and unique place to store their porn and a way of increasing the chances of getting their lost/stolen device back. We're 5% of the market and the masses are 95%. Samsung losing 5% of their sales is about equal to all the devices HTC will sell in 2013. We're opinion leaders and early adopters but we're not indispensable.
P.S. - I'm not agreeing with what Samsung's doing so please don't shoot the messenger.

BarryH_GEG said:
XDA looks at Knox's impact to customization and shivers. The masses look at it as a safe and unique place to store their porn and a way of increasing the chances of getting their lost/stolen device back. We're 5% of the market and the masses are 95%. Samsung losing 5% of their sales is about equal to all the devices HTC will sell in 2013. We're opinion leaders and early adopters but we're not indispensable.
P.S. - I'm not agreeing with what Samsung's doing so please don't shoot the messenger.
Click to expand...
Click to collapse
I'm sure the 5% are capable to influence another 30% of the masses not to buy Note 3
Sent from my GT-I9300 using Tapatalk 2

when will we know its locked? how long does it take for hackers/devs to find out that it can be unlocked..?
still not sure if i should pull the trigger for the pre order.. im assuming its a 50/50 chance because if i get it now and it can be unlocked and later they update it and it ships with that new update ill be bum and locked out on the fun
i need my root.. dont like ads/crapware

markysd said:
when will we know its locked? how long does it take for hackers/devs to find out that it can be unlocked..?
still not sure if i should pull the trigger for the pre order.. im assuming its a 50/50 chance because if i get it now and it can be unlocked and later they update it and it ships with that new update ill be bum and locked out on the fun
i need my root.. dont like ads/crapware
Click to expand...
Click to collapse
I just realized how much I use Root lol, def gonna need that at a min if I want to switch

[Q] Question on specs + romming Samsung phones

I've only had the OG Droid and Nexus phones since so I'm a bit unfamiliar with non-Nexus devices.
I wanted to ask a few questions in one place.
In order
f I buy a carrier unlocked version (US) of the S7, is the bootloader unlocked/unlockable such that I could install TWRP?
Is there typically an AOSP rom available for the Galaxy S phones? (Such that Xposed + Gravitybox is a viable option)
If I do unlock the bootloader and install an AOSP rom, from what I heard there's a counter that gets tripped. (Knox?). Exactly how much of the waranty does that void if any?
I've heard that the RGB LED behaves differently under Touchwiz, is that strictly a software issue such that if I were using an AOSP based ROM, it would behave how I'm familiar from say the original Nexus 5?
(I'm currently still on my Nexus 5 and my hardware requirements for upgrading is RGB LED light + SD Card slot, so provided I can do what I want software-wise, this phone is looking like the winner)

Trel said:
[*]f I buy a carrier unlocked version (US) of the S7, is the bootloader unlocked/unlockable such that I could install TWRP?
Click to expand...
Click to collapse
Be careful with this one. Carrier unlocked != unlocked bootloader. You can SIM unlock an AT&T phone for example, but the bootloader will remain locked severely limiting it's "modability". You didn't say who your carrier was, but for us GSM folks, best bet is an unlocked international version or a T-Mobile phone (typically come with unlocked bootloader).
Trel said:
[*]Is there typically an AOSP rom available for the Galaxy S phones? (Such that Xposed + Gravitybox is a viable option)
Click to expand...
Click to collapse
Yes and no. Previous generations have had a lot of developer support. The S6, OTOH, with it's proprietary Exynos chipset, has received a very luke-warm reception. Heck, currently my 3 year old $80 MotoG has a more functional version of CM13 than any of the S6 variants! With the US versions of the S7 sporting the SD820 chipset, I'd think this phone will get a boatload of developer support (but I make no guarantees).
Trel said:
[*]If I do unlock the bootloader and install an AOSP rom, from what I heard there's a counter that gets tripped. (Knox?). Exactly how much of the waranty does that void if any?
Click to expand...
Click to collapse
Not always/entirely true. For example, there's a method to flash a custom rom on the locked down AT&T S6 that does not trip KNOX. That said, ROM options without tripping KNOX are very limited and usually lag significantly so many people just go ahead and trip it without giving it much thought. You may or may not void warranty, and will likely loose some proprietary functionality (Samsung Pay), but being able to "tinker" is well worth it.
Trel said:
[*]I've heard that the RGB LED behaves differently under Touchwiz, is that strictly a software issue such that if I were using an AOSP based ROM, it would behave how I'm familiar from say the original Nexus 5?
Click to expand...
Click to collapse
Yes, the RGB LED issues are software related and there are many options to address them (including Xposed modules that work with TW roms).
Trel said:
(I'm currently still on my Nexus 5 and my hardware requirements for upgrading is RGB LED light + SD Card slot, so provided I can do what I want software-wise, this phone is looking like the winner)
Click to expand...
Click to collapse
The S7 has a lot going for it. However, coming from a GED, you might want to wait a few months to see if the developer community does indeed embrace the new device before jumping on the bandwagon though...

dew.man said:
Be careful with this one. Carrier unlocked != unlocked bootloader. You can SIM unlock an AT&T phone for example, but the bootloader will remain locked severely limiting it's "modability". You didn't say who your carrier was, but for us GSM folks, best bet is an unlocked international version or a T-Mobile phone (typically come with unlocked bootloader).
Click to expand...
Click to collapse
I know the difference. International doesn't have snapdragon or is that strictly the EU one with the Exynos chipset? I know AT&T and Verizon will never have the bootloader unlocked. I'm asking about a fully paid T-Mobile one or if I get a generic one somehow.
Yes and no. Previous generations have had a lot of developer support. The S6, OTOH, with it's proprietary Exynos chipset, has received a very luke-warm reception. Heck, currently my 3 year old $80 MotoG has a more functional version of CM13 than any of the S6 variants! With the US versions of the S7 sporting the SD820 chipset, I'd think this phone will get a boatload of developer support (but I make no guarantees).
Click to expand...
Click to collapse
Are the international and the EU version separate phones? If so, then I'll probably get International and end up with the Snapdragon one, but if they're on in the same, I'd not go for that. I know how little support Exynos ends up with.
Not always/entirely true. For example, there's a method to flash a custom rom on the locked down AT&T S6 that does not trip KNOX. That said, ROM options without tripping KNOX are very limited and usually lag significantly so many people just go ahead and trip it without giving it much thought. You may or may not void warranty, and will likely loose some proprietary functionality (Samsung Pay), but being able to "tinker" is well worth it.
Click to expand...
Click to collapse
A custom rom wouldn't include TWRP which would be useless to me then. Since I'd want a custom recovery as well, I'd be tripping Knox unless there's some new exploit. Specifically in the US, what do you lose if you trip the Knox counter?
Yes, the RGB LED issues are software related and there are many options to address them (including Xposed modules that work with TW roms).
Click to expand...
Click to collapse
If it's pure software, then that's perfect. I would only use an AOSP or AOSP based ROM anyway. I can't stand Touchwiz when I have to help relatives with their phone, so if the issues are limited to TW based ROMs, I'd never run into them.
The S7 has a lot going for it. However, coming from a GED, you might want to wait a few months to see if the developer community does indeed embrace the new device before jumping on the bandwagon though...
Click to expand...
Click to collapse
Probably a good idea anyway. I've discounted this phone up until yesterday as I was told that it would have active display in lieu of an RGB LED which is strict 100% deal breaker for me. (huge storage could possibly make up for lack of SD Card support, but lack of LED = no go).
I'll wait it out then, as I can probably also get a good deal if I wait a bit.

What are pros and cons of flashing a stock Android on the S7?

so i haven't had a samsung phone since 2003 until the S7. the last few phones i had were running stock android, without all the crap and i loved it. now, i know that samsung ui brings with it some benefits. what would i lose (and gain) if i flashed a stock android rom on my S7? thanks

1) not sure there already is a stock rom for S7 ...
Pros:
+ Getting stock android
Cons:
- Loss of some/most/all "samsung" features (possibly also some fingerprint support and so ... )

im not sure if you know the home screen launcher (called samsung touchwiz) can be replaced with better ones like nova launcher and such... is that what you mean by Samsung UI?
changing roms actually change the functionality of the Android system wide functions/features, its different to the home screen UI.
the rom that came with your s7 is stock samsung you could say. Samsung made it, so everything, all the hardware works with the rom... some people want more software features or less features and so flash other roms, like vanilla stock roms or asop/cm roms, even though it may mean some software features wont work and even some hardware functions.
Every rom dev will tell you what's on offer and what the issues are.
the s7 is quite fast now, so you could just root the current rom (once root is available for your model) and remove/freeze apps known not to be required to clean the rom of Samsung junk. also install xposed to add new system wide changing features and such, but the more you mod the more risk of having issues.

"Stock" android is called AOSP okay? It's a little confusing when you say it like that.
Anyhoo, AOSP is faster than TW, and you will have constant update even when S7 is not supported by samsung anymore. However, Samsung made sure that TW is best compatible with their devices so you wouldn't notice any difference at all when it comes to speed. Also when flashing AOSP, you will lose almost all features TW has.

I wouldn't recommend flashing a stock android. Reasons:
1. you'll have to void your warranty and trip the Knox counter. This is a one way street, there is no known method to "untrip" this counter, so Knox will be disabled on your phone (even some samsung services like samsung pay MIGHT be disabled)
2. the s7 hase plenty of power and enough ram, so "having more free ram" or "faster app opening speeds" isn't hardly an argument nowadays anymore.
3. Bloatware removal? Well, at least my s7 (exynos version with dtm german telekom image) came surprisingly clean. Microsoft Office, the usual google apps and the usual samsung apps. No Bild.de, hrs hotels or such crap anymore. And you can disable the apps you don't want easily via the app manager or via another android app called psp (or similar, just search the s7 subforum a bit, you'll find it).
4. optimization: as the posters stated above: the s7 rom is designed for the s7, and just the s7. so all the hardware is probably supported the best under this rom. in the early days of android one just had to cope with the 2g/3g modem, acceleration/light sensor, wifi and perhaps gps. nowadays there is tons of stuff more: fingerprint, special bluetooth low energy functionality, special camera sdks (mostly not public), magnetometer, some people also believe there is a fm radio chip in the s7... and so on and so on... this is making things difficult to implement for the developers of rom bundles as cyanogenmod or aosp.
---> if your only concern is the newest android in case of security: the s7 has android 6.0.1 now, this version has a decent capability to get SECURITY updates from google directly. Meaning the most crucial android wide security loopholes will be fixed. no more "stagefreight will never be patched for my 2,5 year old phone" anymore.
---> if you always want the newest roms for the newest pure android features: I assure you, samsung is sometimes ahead of those. the 5.x rom I am currently using on my xperia mini pro is actually pretty similar in case of functionality/usability with the 4.x rom of my s5. many of the features I missed in the pure 4.x which samsung implemented are now standard in the 5.x "clean android".
I guess you should just lay low and wait for your guarantee to be over OR reconsider once a good rom is available which has features that you urgently want.
I'm also currently waiting for a rooting method which doesn't trip knox to appear so that I can root my s7 and start using it. It's just in the original packaging right now waiting...
-acid

AcidBurns said:
I wouldn't recommend flashing a stock android. Reasons:
1. you'll have to void your warranty and trip the Knox counter. This is a one way street, there is no known method to "untrip" this counter, so Knox will be disabled on your phone (even some samsung services like samsung pay MIGHT be disabled)
2. the s7 hase plenty of power and enough ram, so "having more free ram" or "faster app opening speeds" isn't hardly an argument nowadays anymore.
3. Bloatware removal? Well, at least my s7 (exynos version with dtm german telekom image) came surprisingly clean. Microsoft Office, the usual google apps and the usual samsung apps. No Bild.de, hrs hotels or such crap anymore. And you can disable the apps you don't want easily via the app manager or via another android app called psp (or similar, just search the s7 subforum a bit, you'll find it).
4. optimization: as the posters stated above: the s7 rom is designed for the s7, and just the s7. so all the hardware is probably supported the best under this rom. in the early days of android one just had to cope with the 2g/3g modem, acceleration/light sensor, wifi and perhaps gps. nowadays there is tons of stuff more: fingerprint, special bluetooth low energy functionality, special camera sdks (mostly not public), magnetometer, some people also believe there is a fm radio chip in the s7... and so on and so on... this is making things difficult to implement for the developers of rom bundles as cyanogenmod or aosp.
---> if your only concern is the newest android in case of security: the s7 has android 6.0.1 now, this version has a decent capability to get SECURITY updates from google directly. Meaning the most crucial android wide security loopholes will be fixed. no more "stagefreight will never be patched for my 2,5 year old phone" anymore.
---> if you always want the newest roms for the newest pure android features: I assure you, samsung is sometimes ahead of those. the 5.x rom I am currently using on my xperia mini pro is actually pretty similar in case of functionality/usability with the 4.x rom of my s5. many of the features I missed in the pure 4.x which samsung implemented are now standard in the 5.x "clean android".
I guess you should just lay low and wait for your guarantee to be over OR reconsider once a good rom is available which has features that you urgently want.
I'm also currently waiting for a rooting method which doesn't trip knox to appear so that I can root my s7 and start using it. It's just in the original packaging right now waiting...
-acid
Click to expand...
Click to collapse
thanks for the post. i'm not worried about the warranty. i've rooted the last 3 phones i had and never needed warranty claim. i just like running aosp as its very clean and when rooted gives me more customization options. i could care less about samsung pay or fingerprint scanner and such. so i'm ok with losing it. buying the s7 i was really looking for great hardware which it has and flashing aosp on it. the only reason i didn't go with nexus 6 is because there's no sd card.

You will not see any AOSP roms available for Exynos variants. Snapdragon variants have locked bootloader so unless Samsung unlock it (which I think may be a possibility) you will not see any roms for Snapdragon variants.
Sent from my SM-G935F using Tapatalk

If you want custom roms, the S7 isn't the phone for you.
Gesendet von meinem SM-G900F mit Tapatalk

Was never a fan of flashing aosp over touchwiz unless the S7 had a gpe counter part and a port was made or something. I hade the m8 on verizon but there was also a m8 gpe as well so that was a great experience because that was just ported over and all the features were still there the boomsound, HTC camera app ect. Usually you lose on a lot of factory features that were made for that phone and what I realized when flashing aosp Roms was the drastic downgrade in camera quality, that was during the s3 and note 3 for me.
I mean I'll definitely give a aosp rom a shot no doubt about that. if we even make it that far with the s7. We still need root and unlocked BL first to even be thinking about all that. Unless you got the exynos version.

One big thing for me usually is the camera...
Somehow the stock camera is always easiest, best, flexible and most comfortable. Never really found a camera which could replace it (either not all functionality available, or just not working as smooth). But yeah, it's not as if there is (or likely will be) an AOSP rom for the S7...

Deciding on a tablet to root w/o voiding warranty?

I have a Galaxy S7 Edge and I understand there currently is no way to root it without tripping Knox. Now I dont want to get rid of my phone as I really do like it and probably intend to stick with future Galaxy products.
However I would like a rooted device so I figured maybe a tablet would work. So my question is, what is some modern tablet that I could buy and root without voiding warranty. It doesn't have to be a Samsung product (that pesky Knox) but as long as its a modern android tablet that can handle today's games and can be rooted without voiding warranty would do.
I appreciate your responses in advance.

Doubts regarding this phone

Hello guys, recently I dropped my LG G2 and broke its screen, so I decided to buy a new phone. I've searched a lot in the internet and I think I'm going to buy a Galaxy S7, but before doing so, I would like to get these questions answered (I would really appreciate if you could answer these questions, it'd help me a lot):
1. Which version would you recommend me to buy, S7 or S7 Edge? Is it purely up to my taste or are there any key differences? When it comes to my taste, I prefer S7 because I don't like the curved edges.
2. Should I pick the Snapdragon version or Exynos version? I have the possibility to choose, which one is better?
3. I'm afraid of burn-ins that are very common on AMOLED screens, does this phone suffer from kind of problem?
4. Is it possible for me to root this phone and then unroot it without letting Samsung know it was previously rooted (I mean, still get warranty after unroot)?
5. What about custom ROMs? Are they easy to install on this phone? what about camera driver, is it released by Samsung or is it closed source? (I'm asking this because my current phone, LG G2, doesn't have its camera driver released by LG, that means, we use a generic camera driver on custom ROMs like LineageOS and thus reduces the camera quality a lot)
Thank you for your time

1. Personal choice, same specs, bigger battery/screen in Edge
2. Exynos (Snapdragon is bootloader locked)
3. Not been many complaints, only a handful
4. No, once you flash custom you permanently trip KNOX, no reset
5. Not as easy as older phones but still fairly easy, camera driver not open source afaik, needs a touchwiz ROM for full quality

Thank you for your answers.
About question 4, all I want to do by now is root and use this app:
http://www.androidpolice.com/2017/08/12/hands-battery-charge-limit-rooted-devices-exactly-expect/
Don't you think I can root and use this, then unroot and still get warranty? (I'm asking this because you said "flash custom", maybe you got me wrong)

I think, re: 4, and what Detection said is that you will trip the Knox, and then Samsung will know the phone has been OS tampered at it's root level. What will Samsung do then about your warranty, knowing you intentionally breached their OEM OS?

Root is custom, root trips knox