[Q] Experiences with Kernel Manager or Kernel Manager Lite? - Thunderbolt General

I've been flashing kernels through Clockwork, but I decided to download Kernel Manager Lite and I'm considering trying it. Has anyone had any experiences with it, good or bad? I'd appreciate any feedback before giving it a go. Thanks

it's works flawless for me, i use the free one.

The only problem I've run into was flashing a kernel while on BAMF 1.6, it worked but broke wifi. I flashed the same kernel using clockwork and wifi was back with no problem. I read someone else had the same problem.
Sent from my ADR6400L using XDA Premium App

That might have been me and more of a 1.6.1 ROM issue which has Kernel Manger Lite included. My story:
http://forum.xda-developers.com/showpost.php?p=13444295&postcount=351
icesteve said:
The only problem I've run into was flashing a kernel while on BAMF 1.6, it worked but broke wifi. I flashed the same kernel using clockwork and wifi was back with no problem. I read someone else had the same problem.
Sent from my ADR6400L using XDA Premium App
Click to expand...
Click to collapse

I was using kernel manager pro when I attempted, not the one included in the rom. I figured it had to be kernel manager because CWM flashed it perfectly.
Sent from my ADR6400L using XDA Premium App

Thanks for the responses. I'll probably give it a try. I guess I can always reflash through Clockwork if anything goes wrong. Or worse case, I can flash a backup if anything gets seriously out of whack.

bunklung said:
That might have been me and more of a 1.6.1 ROM issue which has Kernel Manger Lite included. My story:
http://forum.xda-developers.com/showpost.php?p=13444295&postcount=351
Click to expand...
Click to collapse
I had the same problem .. I never considered that it may have been kernel manager .. thanks for that
Sent from my ADR6400L using XDA App

For me the issue is this ...
No backup made prior to flashing ... I'm sticking w/ RM for kernel flashing

Based on my experience with BAMF rom and leanKernel, it appears that any customization scripts and/or files that the kernel developer intended for you DO NOT get flashed with Kernel Manager (I have Pro version). The people with broken wifi using KM but working wifi with RM proves the point. My experience was that 4G hotspot didn't work when flashing leanKernel from KM, but works fine with an RM flash. This is actually a common problem across several devices I've used. Many kernel devs modify the wifi driver and/or other things in a manner that they end up only working with their specific ROM. The do this by including the modified files in their zip package along with a script telling the phone what to put where. The issue becomes if you switch to a kernel that's relying on a stock wifi driver, and doesn't put it back on its own, then you've got a busted wifi. The only way around that is to manually push/restore a copy of a wifi driver known to work with the kernel you're using. I kind of regret paying for the pro version after finding this out; hopefully the KM folks can figure it out. The kernel itself is just the boot.img file; the add-ons files that go into the /system partition or where-ever. If you're interested in knowing what a particular kernel is pushing on your phone, just open the zip file and drill down through the folders to find what files are in /system tree. This is also a way to find files you need to go back to stock drivers, just find a stock rom that's flashable in RM and drill down to the files in /system/lib and push them back to the phone via adb or root explorer.

i bought the pro version and i wish i hadn't. i downloaded/flash one of protekks kernels through there and it sent my phone into a bootloop and by the time i'd flashed a nandroid backup the 15 minutes had gone by -_______-

why?
I haven't actually tried this yet, I guess the question for me is why? Does it do something that CW cannot do? I don't know much about the product so I am just trying to understand the benefit of installing it.

turbosrrgood said:
I haven't actually tried this yet, I guess the question for me is why? Does it do something that CW cannot do? I don't know much about the product so I am just trying to understand the benefit of installing it.
Click to expand...
Click to collapse
It will notify you of kernel updates, and you can filter kernels based on what you want
Sent from my ADR6400L using XDA Premium App

Related

Phone wont bootup on Imoseyon kernel

Just flashed imoseyon's kernel on my rooted thunderbolt and now I'm stuck in a bootloop...any advice? I've running stock rom.
It's the lean version of his kernel and thats the only thing I flashed. I cleared cache + davik cache before flashing.
I was able to do a restore, but I want to use this kernel
It sounds stupid, but try again. Clear cache and dalvik
I've tried 5 times Even tried uninstalling setcpu and unfreezing all the bloatapps that I had frozen. Still get stuck on boot
I've also tried re-downloading the kernal file in case it was corrupt...no luck still.
Which Imoseyon kernel are you running?
Could it be that your particular Tbolt won't handle the lower voltage? Also you might want to check the md5sum again.
Good luck.
brenick said:
Which Imoseyon kernel are you running?
Could it be that your particular Tbolt won't handle the lower voltage? Also you might want to check the md5sum again.
Good luck.
Click to expand...
Click to collapse
I said its the lean version, and he doesnt post md5sum so I have nothing to compare to. But thanks for using my thread to +1 your post count....
wifi is broke and my data is stuck on 1X only now after doing advanced restore-->reboot only.
Did you flash the GB Sense kernel instead of the Froyo kernel?
I used this 1... http://forum.xda-developers.com/showthread.php?t=1021404 It says Froyo... where can I find the stock kernel that you get after rooting? I need to get wifi/data working again now.
I mount the phone as disk drive on my computer, and I can only view the SD Card...ugh whats going on, so many issues after flashing this kernel
I did a factory reset now and I still cant connect to wifi/3g/4g...I think I need to flash the stock kernel to fix it. Can someone point me in the right direction please?
Flash another rom such as BAMF, whenever you flash a rom it flashes the kernel that is included in the rom as well.
I'm using his kernel just fine. Can you check your radio version?
Sent from my ADR6400L using XDA App
radio 1.16.00.0402, and Im on the stock ROM, dont want to use a special ROM...
Flash a rom or the stock rom that should get you on another kernel. Also, my TB couldn't handle some of the kernels. I was never able to get it at 1.92ghz. I can only use the normal version. Try one of the other versions. Best of luck!
Sent from my DROID PRO using Tapatalk
make sure the kernel is not oc'd to 1.92.................most phones can not handle that.

HELP! Tried to root/overclock phone broke phone

Hi Guys,
I checked around but I couldn't find anything. I rooted my phone using the 1 click method provided here http://forum.xda-developers.com/showthread.php?t=1096384 This part went swimmingly. I had my phone rooted and ready to go. I then downloaded CPU set and the program would not let me speed up the CPU past 1 Ghz. so then I downloaded this: kernal netarchy-nexus-1.3.0.2-bfs-2.3.3-cm7-compat-signed which supposedly allowed me to overclock my phone. I then placed the zip file into the root directory of my phone. I downloaded ROM manager and used that to install netarchy-nexus-1.3.0.2-bfs-2.3.3-cm7-compat-signed. When I did this the screen went black and the capacitive buttons at the bottom lit up. I can reach the recovery screen but that is it. There is no USB connectivity with the computer. Is there anyway to fix this or did I just turn my phone into a paper weight.
Thanks,
Cloo
Phone processors are a funny thing. Some can handle being overclocked higher than others. I am assuming that you went all the way up to 1400 and your CPU just gets too hot and everything locks up on you. You need to have a rooted Rom on the root of your sdcard and wipe everything from recovery and flash the Rom from recovery and start over. If you go with Netarchy's kernel again I suggest bumping the CPU up to 1200. If it can handle that bump it up to 1300 and obviously it can't handle 1400. You won't see much of a benefit from 1000-1300 for the most part. I keep mine on 1200 and it runs great. Anything higher for me and the phone starts to get hot and lag somewhat. Your phone is not a brick. If you can get to recover and/or bootloader there is always hope.
Also check out these threads to help you get back to 100% stock and start over.
http://forum.xda-developers.com/showthread.php?t=1072698
http://forum.xda-developers.com/showthread.php?t=1103727
Do you have a NS4G which is what the one- click is developed for or a Nexus S, which is what the Kernel you flashed is for? My guess is that you flashed a kernel which is not compatible with your rom.
Sent from my VEGAn-TAB using Tapatalk
You may not have waited long enough for the phone to boot. His bfs based kernels have a bug that most of the time the phone boots to a black screen captive light shows and no boot animation. It will boot but just takes time of you have right kernel. This is spoken about in his thread.
@housry I never got all the way through the switch to netarchy. Once I used ROM manager the screen blacked out upon reboot and nothing happens now. I managed to get the file SamsungSimpleDL onto my phone but when I try to install it aborts. Any thoughts?
@debh I have the NS4G
@Jerry the phone has been sitting with a black screen for about 10 minutes so I think I screwed something up
According to your op, you flashed a 2.3.3 cm7 kernel. Are you running stock 2.3.4? You need to flash the correct kernel for your rom.
Also, I just read your post above and you aren't supposed to flash the simple.zip on your phone. Download and extract the contents onto your computer and run the .exe from there with your phone connected.
Sent from my VEGAn-TAB using Tapatalk
Deb thanks for the quick reply, am I supposed to have my phone in download mode?
Phone is fixed!!! Thanks to all!
Quick question, im sorry, as I didn't know where to ask. Even checked threads and couldn't find an already posted answer. I have a ns4g, rooted, still on stock rom. Will I still get ota's from google when they push newer software than 2.3.4, which is what I run, and also get ota software bug fixes from goolge when they release it? I really hope so, as I want to stay current with the latest builds from google.
Sent from my Nexus S 4G using XDA App
sh4nk said:
Quick question, im sorry, as I didn't know where to ask. Even checked threads and couldn't find an already posted answer. I have a ns4g, rooted, still on stock rom. Will I still get ota's from google when they push newer software than 2.3.4, which is what I run, and also get ota software bug fixes from goolge when they release it? I really hope so, as I want to stay current with the latest builds from google.
Sent from my Nexus S 4G using XDA App
Click to expand...
Click to collapse
It will be faster to find them on XDA than the wait for OTA
Thank you Plus waiting a little bit will skip any bugs to be fixed lol
Sent from my Nexus S 4G using XDA App

[Q] P999 after CM7, or any custom ROM

I've decided that I would love the customization stuff in Cyanogen7, so I'd like to root, flash and install a custom ROM. I'd love to have the customization of CM7 vs the stock Froyo I have from WIND. Right now, there is no crapware, and the phone is quite fast. The only thing that I wish worked is the Skype front camera, which is supposedly to work in Gingerbread. Apart from that, everything works great. I am afraid to lose the functionality, so I'd like if someone has the WIND LG with CM7, to try to answer if there are any issues with the following points:
* phone of course
* GPS, Google Maps, Market, Messaging
* both cameras, 1080p recording and HDMI output
* video talk in Skype
Also, feel free to leave a short feedback about CM7 and a recommendation. Thanks.
Skype front camera doesn't work in Gingerbread... GTalk video chat works on CM though.
Rusty! said:
Skype front camera doesn't work in Gingerbread... GTalk video chat works on CM though.
Click to expand...
Click to collapse
Does that generally mean that there is no problem with the lack of Nvidia's code? Does that mean Microsoft's to blame?
Skype just needs updating to support nVidia camera
OK, I'm assuming all the above works. If the general procedure is to root, flash, install, when does the unlocking of the phone happen? Also, do you need to upgrade to 2.3 stock, before loading CM7, or ca you do it off 2.2?
Also, since no one has said anything about the points above, are there ANY bugs with CM7 or EB?
Also, is there a unified guide to custom ROM loading from stock?
Does everyone use this one http://forum.xda-developers.com/showthread.php?t=1060715 ?
Hello fellow WIND user.
I am using CM7 nightly build 123 on my G2X and almost everything works fine. Save for the camera issue stated earlier and the impossibility of getting a GPS lock. I have tried several 'fixes' posted in the forums for this issue but I can't seem to get GPS lock regardless.
I still recommend switching away from stock ROM because it grants your device more flexibility and possibly a longer battery life.
Rooting and installing a custom ROM does not unlock your phone. You will still need to obtain an unlock code from either WIND (free after 3 months I think) or the web (for a price).
You do not need to upgrade your Android OS before flashing. The OS is part of the ROM you will be flashing onto your device. You will however, need to root, backup, and wipe your device. Just follow the guides on the forum which you have found.
If the wind version is the same procedure-wise, rooting is a redundant step. Installing CWM via nvflash does not require root. Once that is installed, you may backup, restore, and flash to your heart's content.
Sent from my LG-P999 using Tapatalk
Darcho said:
Hello fellow WIND user.
I am using CM7 nightly build 123 on my G2X and almost everything works fine. Save for the camera issue stated earlier and the impossibility of getting a GPS lock. I have tried several 'fixes' posted in the forums for this issue but I can't seem to get GPS lock regardless.
I still recommend switching away from stock ROM because it grants your device more flexibility and possibly a longer battery life.
Rooting and installing a custom ROM does not unlock your phone. You will still need to obtain an unlock code from either WIND (free after 3 months I think) or the web (for a price).
You do not need to upgrade your Android OS before flashing. The OS is part of the ROM you will be flashing onto your device. You will however, need to root, backup, and wipe your device. Just follow the guides on the forum which you have found.
Click to expand...
Click to collapse
NOOO!
The camera and the GPS are two thing I love about this phone...
1080p not resolved since May? http://forum.xda-developers.com/showthread.php?t=1074795&page=2
Is this issue universal across all custom roms with p999, or just with CM7, or just with you? Can an EB or another CM7 chime in? Wouldn't EB be more stable than CM, since it is not rewritten?
r4d14n7 said:
If the wind version is the same procedure-wise, rooting is a redundant step. Installing CWM via nvflash does not require root. Once that is installed, you may backup, restore, and flash to your heart's content.
Sent from my LG-P999 using Tapatalk
Click to expand...
Click to collapse
So, intuitively speaking:
1. Install CWM: http://forum.xda-developers.com/showthread.php?t=1056847
I'm not familiar with the terminology, can you point out the helping threads about backing up, restoring and flashing?
Also, can the whole procedure be done on Linux, or do I have to install VBox?
You can do it from Linux. You just type some commands in a terminal to push an img file over to the phone.
Backup/Restore is a menu option in the clockwork recovery. Pretty straight forward stuff.
Flashing just on your phone just entails downloading the rom file (zip format) to your SD card and going in clockwork recovery and selecting it (flash zip from SD) via the menu.
Quick steps
-NVFlash
-Backup
-Download CM7 to SD
-Flash CM7
After you flash CM7 you'll have root access thus allowing you to use easier methods of downloading and flashing using Rom Manager
Sent from my LG-P999 using xda premium
player911 said:
You can do it from Linux. You just type some commands in a terminal to push an img file over to the phone.
Backup/Restore is a menu option in the clockwork recovery. Pretty straight forward stuff.
Flashing just on your phone just entails downloading the rom file (zip format) to your SD card and going in clockwork recovery and selecting it (flash zip from SD) via the menu.
Quick steps
-NVFlash
-Backup
-Download CM7 to SD
-Flash CM7
After you flash CM7 you'll have root access thus allowing you to use easier methods of downloading and flashing using Rom Manager
Sent from my LG-P999 using xda premium
Click to expand...
Click to collapse
Thanks you.
And by backup, you mean this? source: http://forum.xda-developers.com/showthread.php?t=1060715
Perform a Nandroid Backup of your Phone (Optional but suggested before you flash any ROM or make any O/S changes):
1. Bootup to NvFlashed Clockwork Recovery using the button method.
2. Choose backup/restore and run a backup.
3. This will save the backup to your internal or external SD Card depending on which version of CWM you selected in the One-Click App.
aplsux said:
NOOO!
The camera and the GPS are two thing I love about this phone...
1080p not resolved since May? http://forum.xda-developers.com/showthread.php?t=1074795&page=2
Is this issue universal across all custom roms with p999, or just with CM7, or just with you? Can an EB or another CM7 chime in? Wouldn't EB be more stable than CM, since it is not rewritten?
Click to expand...
Click to collapse
These questions are a bit more interesting to me.
Wouldn't this fix the camera? http://forum.xda-developers.com/showthread.php?t=1094424
It is for the Optimus 2x, will it be different? Is the camera different? The thread itself says yes, it works for g2x, has anyone field-tested it? For let's say latest CMs? 2.3.5?
That's built into CM
TO THE OP... Hi there, did u ever end up installing cyanogenmod on your device?
I'm running a cm7 variant & have had no problems w gps or camera or anything of the sort
Dave778 said:
TO THE OP... Hi there, did u ever end up installing cyanogenmod on your device?
I'm running a cm7 variant & have had no problems w gps or camera or anything of the sort
Click to expand...
Click to collapse
Yes, I did 2.3.5.
GPS is fine. Battery is good. Camera is OK, but LG one was better. I haven't recorded HD to see if there's a sound mismatch, yet. Is there 1080p? Assuming change after the official LG 2.3
aplsux said:
Yes, I did 2.3.5.
GPS is fine. Battery is good. Camera is OK, but LG one was better. I haven't recorded HD to see if there's a sound mismatch, yet. Is there 1080p? Assuming change after the official LG 2.3
Click to expand...
Click to collapse
Everything is fine, stop being a worry wart
aplsux said:
I am afraid to lose the functionality, so I'd like if someone has the WIND LG with CM7, to try to answer if there are any issues with the following points:
* phone of course
* GPS, Google Maps, Market, Messaging
* both cameras, 1080p recording and HDMI output
* video talk in Skype
Also, feel free to leave a short feedback about CM7 and a recommendation. Thanks.
Click to expand...
Click to collapse
In short, go for it. I bought the phone back in late June, had CM7 running on it a few hours later, and haven't looked back. I've currently got nightly #123 along with Faux's undervolted DS battery driver kernel and am very happy with the responsiveness, the added features, and so on. There's been a slowdown in nightlies recently due to a problem with the repository, but the features being prepared in the interim will continue to refine what is already a great phone. Battery life is way, way up compared to stock, thanks to refinements in the kernel and using SetCPU profiles to cut power use when the screen is off.
Messaging is fine, although I'm using Handcent rather than stock. Maps is fast (GPS aside) and the camera is good (again, using aftermarket, currently Vignette). I've only recently begun to use video talk - Skype doesn't support this phone yet but Google Talk now works. There are some issues, of course. The GPS continues to be slow - locks range from 10-20 seconds outdoors in an open space to virtually never indoors (in places where my older, cheaper phone did lock).
Tv
Yeah, yeah... CM7
Honestly, this ROM goes over the roof when it comes to customization.

[Q] Having issues once flashed to stock via Odin

I flashed to both versions listed on http://forum.xda-developers.com/showthread.php?t=1092021 and am seeing the same issues with both.
The time is 4 hours off, I can uncheck auto-time and check it again and the time will be correct for maybe 5-10 min before returning to 4 hours later.
Everytime I try to download apps through the market, I get "Application Name" could not be downloaded due to an error. This is true regardless of wifi vs hspa.
With the pure stock version, superuser is still installed. Should I have unrooted it before attempting this? I simply followed the directions listed on that post.
Flash the original firmware located in Entropy's Ultimate unbrick thread uckd5. That version is pure stock that is not already rooted. To be safe use the included pit file.
Sent from my SAMSUNG-SGH-I997 using xda premium
Bronk93 said:
Flash the original firmware located in Entropy's Ultimate unbrick thread uckd5. That version is pure stock that is not already rooted. To be safe use the included pit file.
Sent from my SAMSUNG-SGH-I997 using xda premium
Click to expand...
Click to collapse
i think the time issue is with the modem.......i got the same thing when flashing the new ones.
try another one and see if the issue sticks
glorifiedQA said:
I flashed to both versions listed on http://forum.xda-developers.com/showthread.php?t=1092021 and am seeing the same issues with both.
The time is 4 hours off, I can uncheck auto-time and check it again and the time will be correct for maybe 5-10 min before returning to 4 hours later.
Everytime I try to download apps through the market, I get "Application Name" could not be downloaded due to an error. This is true regardless of wifi vs hspa.
With the pure stock version, superuser is still installed. Should I have unrooted it before attempting this? I simply followed the directions listed on that post.
Click to expand...
Click to collapse
The time thing is a modem issue. The time worked fine when I used the newer gingerbread leak for a few days.
Sent from my SAMSUNG-SGH-I997 using xda premium
Can you clarify what you mean by a modem issue? Sorry I'm a total noob. I tried GTG's ultimate unbrick and the clock is still off. Market works, but it also worked for about 5-10 min after I flashed it last time.
Thanks for the help so far, hopefully I can get this sorted out.
Also if anyone can suggest a solid GB rom with working activesync/SSL I'd be pretty happy. I tried the most recent Infused, but I really need to be able to sync my corporate email and that isn't possible with Infused.
Edit: Fixed time by checking and unchecking automatic time and it looks like the proper time is staying. Also, the market is also working just fine! Thanks for all the help! Still open to some custom rom suggestions
Edit 2: I'm a liar, rebooted the phone to test and it reboots with the improper time :-\ Market still works on reboot though
Installed Infused 1.6.0 just to have something working on my phone, but that also failed to fix the time. (My phone == my alarm clock, so this has been more than a bit annoying)
Thanks for the continued help!
Not sure if bumping is frowned upon, feel free to yell at me if it is, but I could still use some help!
http://forum.xda-developers.com/showthread.php?t=1265207
Flashed to KI3 and now the clock works, thanks for the tip on the modem.

New to Android and been reading.

Hello everyone. I received my Verizon SG3 shortly after it came out. I have been doing reading as I am very new to android. This is my first android phone. Previously I had an EnV Touch. Hated that thing, but it did the job. So any who I now have this awesome kick butt phone and it has all the Verizon crap on it I cannot get rid of. I have rooted and the bootloader is unlocked. I used a windows program to gain root and then used EZ unlocker to unlock the bootloader. I have been looking and looking to figure out what rom I want to start with, I want JB, but don't want a lot of bugs ATM as i don't have all that much time to play with flashing and being still so new I don't want to end up with a brick. I tried my harderst to figure this out by reading, but the info seams so spread out, I kinda want to try the CM10 9-6 as I have read it is stable and not many bugs. My main question is about kernels. Am I correct in thinking they will get flashed just like my rom will in ROM manager? Or do I need to flash through CWMR? How do I know what Kernel to use? I have been reading the CM10 takes a different kernel than say synergy or stock. Or will the stock kernel work till I load the proper kernel. If I knew about the kernel and how vital it was to go with the ROM maybe I wouldn't be so paranoid. I have a friend with a GS2 and he told me the kernel has to go with the ROM and if the two don't mach then you could brick. I can't afford a brick my first time around.
If you could give me some advice or point me in the direction of some more reading that would be great.
Thanks
JB
All ROMs come with a kernel in them. Typically you just stay with it unless you want some extra features or what not. There are aosp kernels and kernels based on the stock firmware. If you use a touchwiz based rom you need to use a touchwiz kernel.
I don't think it will brick it if you interchange them. It will just boot loop
Edit: you flash kernels in recovery just like a rom. if you change kernels without changing roms you need to wipe cache and dalvik cache through recovery also.
Sent from my Nexus S 4G using xda premium
Back up your IMEI before flashing anything, alot of horror stories floating around. Development has some fantastic guides. After that, most of the "big gun" rom's here have kernels, and are for the most part consistently the same flash method through recovery. Cwm recovery is solid and reliable, start with that until you feel comfortable enough to venture off. Make sure it's version 6.0.1.2 (regular or touch) for any jelly bean based rom.
Sent from my SCH-I535 using xda premium
I backed up the IMEI with the terminal emulator. So if the error occurred it would restore with the proper IMEI. Should I back it up any other way too?
Also I'm planning on using the Rom manager to flash the Rom. Do you not recommend that or should I do it manually with CWRM?
Thanks for the replies. I'm still getting my feet wet and know all about searching before asking. Used to program dish.
Sent from my Galaxy S3 using Tapatalk.
Your call, depends how paranoid you are! I would flash manually, it's a control thing for me, I know what/how/when all was done. Using 6.0.1.2 touch is awesome, speeds flashing up considerably.
Sent from my SCH-I535 using xda premium
I might have to try the touch. I have standard 6 on there. The one you listed. Rom manager gives me the option to load touch too. Friend uses Rom manager on his s2. Looks to just automate things a little.
What I don't know is if it wipes the appropriate areas first for a clean install or if it's doing it dirty.
Sent from my Galaxy S3 using Tapatalk.
Use the Synergy backup. If you lose your IMEI you just flash it again and it's back. Just make Nandroid backups and flash away. This is my first Android phone too and now I get why people become flash addicts, it's amazing what you can do. It's easy to relock and unroot if need be. Everything is easy if you take it smart and slow.
Sent from my SCH-I535 using Tapatalk 2
Here here!
Sent from my SCH-I535 using xda premium
Just stick to a couple rules and you will be fine. First is backup, backup and backup before flashing. Always stay within the Verizon SGS3 section, Sounds simple but others have made the grave mistake. When flashing kernels, stick to the software, ie flash a JB kernel to a JB rom, flash a ICS kernel to an ICS rom. You should not have any problems but if you do you always have a backup. There are many roms, just flash an try them, make sure to read through the threads to identify any issues that have been discussed. JB roms there are a couple, a TW based JB rom from a T-mobile leak that was ported to VZW SGS3 that works well, there are official and unofficial JB vanilla roms, ie CynogenMod. Stick to those rules, keep a back up, i usually will transfer a copy of my original backup to my pc just in case, and always backup to external sd card. Good luck and have fun.
You can also flash kernels via Odin I believe.

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