Custom Rom safety question - Galaxy S III Q&A, Help & Troubleshooting

I am rooted on my thunderbolt and have had no issues when flashing new Roms. The S3 will be my first samsung. I will be rooting when I get it but am a bit apprehensive on flashing some of these Roms since I have seen several people Brick their phone already.
I will have the US version. how do you know which ROM's are international and which are safe for US flashing? I read through a couple of the warnings in the development section but must have missed that info somewhere.
thanks.
Are there any ROM's currently available that work 100%?

The US version has its own forum. This is not it. The people that brick their phones do not know what they are doing.

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[Q] Flashing Differnt Roms

Hi i got a question i was looking under the wrong s2 section for a while like the 1900 etc. is it possible for us to flash these roms to our att sg2 ur will it brick the device? the only reason i ask is because we have like maybe two different roms for our phone and that sucks.
just really want to know so good roms to flash and if we can flash maybe like tmobiles roms or anybodys
thanks for your time
beware
only flash roms created for your phone. jmho.
No, you can't directly flash I9100 ROMs.
Eventually a proper porting methodology will probably be determined, but most people have been too busy with initial bringup efforts.
As an example, look at Perception - that's an I9100 port. It IS very easy to port I9100 ROMs for an experienced ROM dev, however, there isn't an "automated" porting method like Hellraiser on the Infuse yet. It just isn't a priority right now.

Basic Vibrant Flashing questions

Hey guys, my mate just bought a second hand vibrant and should be getting it delivered tomorrow, and has asked me to root and flash ICS on it for him.
Owning an i9000 myself, I'm aware of the great roms available, I'm just a bit uncertain about if flashing a new rom would affect the unlock on the vibrant in any way.
I'm using a factory unlocked i9000, and have never managed to lose my IMEI through flashing any roms (I've tried all the major ICS roms), but is there any steps I need to do to preserve the unlock on the vibrant? I remember on the iPhone's we would make custom firmwares using ultrasnow or something to preserve the baseband, anything I need to do on the vibrant like that?
I hate to ask noob questions like this, but it's not my phone and I really don't want to end up with no signal and stress out looking for a fix.
Thanks
Flashing a new ROM wont effect the unlock. I do suggest making a backup of the efs though. If you get Galaxy Unlock from the market it will do it for you.

[Q] Custom Recovery and Rom Question

I'm sure this has been asked but I just wanted to verify I had my information correct, I have rooted and put custom roms on a gs3 in the past so I have little experience but don't want to brick my gs4 and it seems it may be a slightly difference process.
Essentially I want to get CM10 on my Verizon GS4
I found these root directions here http://forum.xda-developers.com/showthread.php?t=2290798
They seem pretty straight forward. I would assume I follow these directions and install TWRP or clockwork mod after its rooted then just flash my roms, however I saw something about Loki on another thread and getting around the bootloader. Do I have to do anything special involving that or once I am rooted can I just install the custom recovery from the app store and start installing roms...
Also how do I check if I have the update that just came out that prevents flashing roms.
Sorry if this was asked but I didn't see my specific question anywhere and I would really appreciate the help.
Also would you recommend going with the google edition or CM10?
Questions and Help issues go in Q&A and Help section
Thread moved
Im fairly certain TWRP is pre-loki'd now, so you wont have to worry about it.
In about phone, look under baseband version, If it doesn't say i545VRUAMDK then you have the new update that isnt rootable yet.
And for your last question, i havent tried either of them yet (I'm on hyperdrive).

To upgrade or not to upgrade? Pros and Cons

I have been seeing alot on the forums lately about MDK ME7 MJ7 etc. I am not new new rooting, and flashing roms and things of the like, and i always make sure to check the forums before any ota update. I have not updated yet. I have actually been running PAC since day 1 on my gs4.
I would like to know the benefits and downfalls of upgrading. All i see is people complaining about the locked knox bootloader and trying to downgrade there phone, but why would anybody want to upgrade to begin with? My phone is on MDK and i am still running 4.3 so i dont see any benefit to upgrading my firmware. Would i get better signal?
I know this has already been talked about on the forums plenty, but i have yet to see a comparison or explaination of why you should or shouldn't upgrade.
To be honest I'm not sure why anyone on MDK would want to update unless they just don't care about flashing roms and don't have any desire to do anything other than root in the future.
Something you may not be aware of is that you can flash the radio from MJ7 and get the added signal bonuses without actually having to take the official update. The file is already floating around the forums somewhere, just search around.
The whole Knox counter thing was added to the bootloader since MI1 from what I know, and basically once you trip it your warranty is void and it's very hard if not impossible to reset the counter. There are really no details on how it's tripped exactly, but a good guess would be when a custom recovery is flashed. If the bootloader ever becomes unlocked for versions MI1 onward then we'll probably get a lot more information on this.
Basically if I had MDK I would never take an official update unless for some reason development flat out stopped/sucked or I had to have an unmodified device for job reasons. Besides that, I'm sure within a few months there will be roms available based on the new MJ7 anyway, so locking yourself in would be pretty foolish.
In the end it's YOUR phone and you can do whatever the hell you want with it. Choose wisely.
Oh, and the Nexus 5 came out today. So there's that, too.

[Q] Confused on where to start. Feeling very risky

Hi, I am a noob to the S2 forums, but not much to xda. I have been working with galaxy y duos development a little.
Right now when I switched my mobile to S2 I visited the development threads. I am very much scared on where to start since my last attempt on flashing a Rom went on costing my IMEI's corruption. Since I had no backups, I had to get it back to service center to recover it.
I have been through various rom development forums. I am confused on which threads are the latest and which threads give a noob friendly explanation on Flashing a rom and thing similar to dual boot and all.
I am in stock 4.1.2 JB. I don't wanna have risk my device again.
1. How to flash CWM from Stock rom?
2. Should I flash a odin flashable CWM with kernel before I would wish to flash Kitkat compatible CWM?
3. How to dual boot? And Is it compatible with all the Roms available (seems not)?
4. I would wish to have stock rom & a custom rom (Neat Rom) in dual boot. Is it possible?
All this information is easily found by searching. These questions have been asked/answered here many times before.
The only way you're not going to feel 'very risky' is by reading:-
*The stickied threads at the top of General (these threads will give you a great grounding in what makes this phone tick, and will give you the knowledge to handle anything that happens).
*The threads related to whatever it is you want to flash (I.E rom/kernel/whatever threads).
If you take the time to do this rather than rushing blindly into things like most people who visit here, you should have the knowledge & confidence to do whatever you want to do. If after doing this you don't have that confidence, leave your phone stock.

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