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Telus Galaxy S2 (T989D) Ultimate Root and Optimization Guide with Steps

jadderley said:
So, does this mean that, even with rooting, the kernel I have for the T989 isn't capable of under/overclocking? If so, how would one go about changing the kernel? Or is the kernel part of the ROM, and should I therefore have a clockable kernel, having flashed to a ROM with that option available in the system settings?

Any thoughts?
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You need a kernel that will overclock. Try this Cerux kernel. Install the zip with recovery. No need to wipe anything. After its installed look in your app tray for an app named kernel tuner. Use that for changing the cpu settings.
 
Atmazzz said:
You need a kernel that will overclock. Try this Cerux kernel. Install the zip with recovery. No need to wipe anything. After its installed look in your app tray for an app named kernel tuner. Use that for changing the cpu settings.
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Before I do, I note that that's for JB 4.2. I'm running 4.1 under CM 10.0.0, will that mess stuff up?
 
jadderley said:
Before I do, I note that that's for JB 4.2. I'm running 4.1 under CM 10.0.0, will that mess stuff up?
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Ok, it was for 4.1.2 also. I've seen a few people still using with 4.1.2, but I can't really say how it will work with 4.1. I was looking through the thread and he said he will be making one specifically for 4.1.2. I've looked for about 30 minutes and can't find what people are using for CM 10. I think most have moved to CM 10.1.

Unless someone else may know a good kernel for CM10, you could wait a few days for him to make the Cerux for CM10, or try CM 10.1.
 
I was curious so I installed CM10 and then tried the Cerux kernel. I could never got it past the CyanogenMod boot screen. If someone else got it to work I don't know how.
 
Atmazzz said:
I was curious so I installed CM10 and then tried the Cerux kernel. I could never got it past the CyanogenMod boot screen. If someone else got it to work I don't know how.
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You are super diligent, sir!! I am amazed at the amount of attention you devote to this particular thread, much less the forum in general! Kudos to you!

I actually tried CM 10.1 (JB 4.2) but when gapps started having glitches again I reverted and didn't go back. Not because I couldn't fix it, but because the additions in 4.2 aren't really anything I was interested in, 4.1 is working fine for me, so I didn't see the need to fiddle with stable but not definitive upgrades.

I have a few feelers out. I'm ordering a second battery since it is possible that my actual battery is having issues holding a charge. I tend to plug it in when I get to work in the afternoon as it's dropped down to no charge by then, and just leaving it plugged in for the next 8 hours so I suspect my routines could have caused undue strain on the battery. I've heard differing opinions on whether these batteries stop charging upon filling completely, but I can't see how constantly trying to fill it when it's full can't be a bad thing. So that's a possibility.

In addition, using greenify I'm finding that the swiftkey keyboard will not hibernate, so I am suspecting that this may also be a contributor to battery drain if it's keeping my phone from deep sleep. I may be wrong about this, as google searches on the topic are producing nothing. One would suspect that if everyone using swiftkey suddenly was finding their phone wasn't sleeping that it would be noticeable. Nonetheless, I'm looking into alternate keyboards (since the stock one on CM10 is quite simply terrible) but I cannot find swype any longer on the play store, I suspect it is now merged with swiftkey...didn't google buy out swiftkey or something?

So I'm looking for a keyboard with either predictive text or swipe capabilities that hibernates when not in use, getting a spare battery (or 3! they're like 3 bucks on ebay!) and may be giving up on underclocking. then again, I also hear that people tend to undervolt instead of underclocking, so I may look into that in the near future.

in summary, thanks for the research! I'm backing away from underclicking right now but if things change I may reassess.
 
I bought a battery off ebay, it was advertised as i believe 2200mah. Which I thought would offer me alot more time. It did not, the OEM Samsung is far more superior. One thing I noticed that I did recently was just installed a data toggler from the app store. Data eats the battery SOOOO much faster. I'd suggest downloading one and see the difference it makes when you just turn on your data every once and a while. You'll get double your battery life guaranteed. Oh and like you I want swype on my rom and haven't been able to find a good rom that carries swype stock. Let me know if you know/find one. Thanks
 
Hello guys!
First of all thanks a lot for the thread and Atma for being such a kind and patient person!
I have read how to root the phone and how to flash a new ROM. Eveything is so clear so far, thank again. I am downloading the both stock roms for my SGH T989-D from Telus.
The thing my phone has never been used in Telus network. When I bought it it was unlocked however it was not rooted. I really needed to root it because I did not feel freedom so regardless I was afraid to lose my unlock I rotted it and everything is fine so far. Now I want to flash a new ROM but I have concerns how my unlock will work after flashing. I am not very familiar with the subject of unlocking so I am not confident and I don't like that :(
Could you please explain me which unlock I have? Will it be lost upon a new ROM flashing?
A few details about my unlock (which probably could help you guys to understand which unlock I have) - so originally it was locked for Telus network, but now it works fine for at least two mobile providers - Mobilicity and Chatr (I am from Toronto) and this unlock remained working after I rooted my phone (So I assume rooting did not damage the unlock). That's basically it what I know about my unlock... Could you please help me out with explanation and explain me how it works and what I probably have.. Thanks a lot!!
:)
 
Hi sinaj :hello:

Welcome to the forums and thanks for the kind words. :)

I don't know a lot about unlocking myself. Usually to unlock a phone you get an unlock code from the carrier. That allows you to use another carrier's sim. What software you are running doesn't affect the sim unlock, so rooting or flashing another rom doesn't lock it.
 
Thank you!
I have just installed the latest stock ROM for my 989D and then [AROMA] All-Star-Rom v7. I really like that ROM (since it's the first after the default with 2.3.5 Android) looks very nice. However there is a little bug related with auto-rotation which it's not that bad, but there is one which is forcing me to choose a different ROM - once I press a button to make a picture - the phone is rebooted :(( I see flash on the screen, looks like picture was taken but right away after that my phone goes to reboot :((

I will report them about that bug for sure but meanwhile - maybe you can suggest me roms which you personally like? I am interested in long life of battery and if possible in latest Android features :)

Btw - there is another question - I saw here - http://androidforums.com/galaxy-s2-...galaxy-s2-t-mobile-all-things-root-guide.html ROMS, Kernels, and themes and if as for ROMS or thems it's less or more clear what's about kernels ? Why there are different versions of the kernel? May I install a certain kernel to my ROM (or any other rom) what is the difference between those kernels (like generally speaking) because even when I was installing my current ROM I was asked which kernel I want and there were like five different kernels (I chose stock one) but I really want to understand... Thanks a lot!!
 
I like the CyanogenMod 10.1 Jellybean rom. There is also a kernel listed there. The Cerux kernel, and it works good with the rom.

A kernel can help some roms run better and allows you to do things like overclocking. When the operating system on your phone talks to the hardware, or vice versa, and wants it to do anything, the kernel is the one that says do it and how. Its like the director of a movie. When a stock kernel says do things this way, someone may make a custom kernel that says, hey, this is the better way to do this.

I can't really tell you the difference between all of them as I haven't used that many. For Jellybean 4.2.2 roms I really like Cerux. I would suggest look through the XDA Android Development forum and just read the different kernel threads and see what they say and see which roms they work with.
 
hey guys just here to clarify a few things, this is a little more that what it took when i had an ace so i just want to clarify lol.
so im running stock 4.0.4 on kodoo, do i follow the original post
Odin 1.8
T989 USB Drivers (Windows only)
Clockmod Recovery for T989 (flash with Odin)

so use the same odin, same clockmod recovery
but use the newer super user link that was posted few pages back
Superuser-3.0.7-efghi-signed.zip

thanks guys :)
 
raptor170 said:
hey guys just here to clarify a few things, this is a little more that what it took when i had an ace so i just want to clarify lol.
so im running stock 4.0.4 on kodoo, do i follow the original post
Odin 1.8
T989 USB Drivers (Windows only)
Clockmod Recovery for T989 (flash with Odin)

so use the same odin, same clockmod recovery
but use the newer super user link that was posted few pages back
Superuser-3.0.7-efghi-signed.zip

thanks guys :)
Click to expand...


Hi raptor :ciao: Welcome to AF.

Yes, you can do that but that CWM is an old recovery. Check this guide for newer CWM recoveries and I would really recommend the TWRP recovery.
 
hey atma thanks for the quick reply, just want to be 100 % sure the version of TWRP in the link above is the right one for 989d? i had bricked my ace with rom manager and am being super safe lol
 
raptor170 said:
hey atma thanks for the quick reply, just want to be 100 % sure the version of TWRP in the link above is the right one for 989d? i had bricked my ace with rom manager and am being super safe lol
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I understand :)

Yes, it will work. You can even run T-Mobile OS on Telus and vice versa.
 
I really hope I am not going to sound too stupid here, but I have a question.

So I had my phone rooted when it was 2.?.? and I have since updated it to 4.0.3

Would the rooting process be the same? same files?

its a galaxy s2, from telus.....


and thank you for keeping this thread going.. .much appreciated...
 
Welcome to the forums Alex :hello:

Yes it should work. I suggest checking the how to root and ROM sticky at the top of the forum. It may be different depending on your android version.
 
Can someone help me rooting my T-Mobile s2 Im on stock 4.0.4 and have no idea what to do. Also what are the latest files I need, I would also like to skip cwm and use twrp instead
 
Hi, guys. Such a complete beginner, had to google "noob". Anyway, thanks to this forum, think I'll be able to root (and then unlock) my phone.

One quick question: if, in future, I need to unroot, I can do it by using the nandroid backup I will create in step 11 of this thread's guide. Is that correct?
 
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