Need some info on MB and MC 3GS...

Bahrovski

macrumors newbie
Original poster
Mar 13, 2010
12
0
Can someone tell what's the difference between MB and MC iPhone 3GS ???

I've seen many MC 3GS with old bootrom and many MB with new bootrom... and vice versa.... :confused:

Is there updated hardware in MC models ? I heard about people not beeing able to jailbreak their iPhone 3GS with old bootrom because it's an MC version !?! :eek: :eek:

so is it related to bootrom version ? to hardware update ? .....
 

Intell

macrumors P6
Jan 24, 2010
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I think that MB is the 3G and MC is the 3Gs and MA is the Original iPhone. They are model numbers.
 

Bahrovski

macrumors newbie
Original poster
Mar 13, 2010
12
0
I think that MB is the 3G and MC is the 3Gs and MA is the Original iPhone. They are model numbers.
I've seen iPhone 3GS with MB on it... That's why I'm confused...

I see this in a lot of forums: "I cant jailbreak my 3GS 3.1.3 coz mine is MC version" or "This jailbreak is not for 3GS MC version only 3GS(non-MC) can be jailbroken"

Is it a misconception ? Are these guys talking about old bootrom vs new bootrom? Or does MC and MB means something else ?

From what I'm read I think people are referring to the old bootrom 3GS (MB version) and the new bootrom 3GS (MC version)... If this is true then why is there 3GS MC with old bootrom and vice versa ??
 

Intell

macrumors P6
Jan 24, 2010
18,872
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There cannot be a MCxxxLL 3G iPhone. Only the 3Gs have this model number. My week 23 3Gs has MC because it's a 3Gs and that explains the model. And there is no such thing as a MB 3Gs. As that model number is used exclusively by the 3G iPhone. The only thing that is different on some 3Gs iPhones is the last character on the US FCC listing. Some end with an A some end with a B. I think the different listing mean they where made by different companies. I do know that the internals of the two listings are a bit different. The listings do not have anything to do with unlocking or jailbreaking.
 

Fyrii

macrumors newbie
Mar 15, 2010
1
0
There cannot be a MCxxxLL 3G iPhone. Only the 3Gs have this model number. My week 23 3Gs has MC because it's a 3Gs and that explains the model. And there is no such thing as a MB 3Gs. As that model number is used exclusively by the 3G iPhone. The only thing that is different on some 3Gs iPhones is the last character on the US FCC listing. Some end with an A some end with a B. I think the different listing mean they where made by different companies. I do know that the internals of the two listings are a bit different. The listings do not have anything to do with unlocking or jailbreaking.
Okay Intell.. I personally have a iPhone 3GS 32GB with the model number MBxxxLL. So there is such a thing as MB 3GS's, I'm not sure where you are getting your "facts" from. Anyways Bahrovski I've done some searching around on both the MC and MB models and the only thing that I came across, which is a wide spread view, is that the MC model is the new boot ROM and the MB model is the older boot ROM. The MC ROM is iBoot-359.3.2 which is not vulnerable to the "24kpwn" exploit. You will be able to Jailbreak both but the only difference is all Jailbroken units with the new boot ROM will have to be tethered to a computer in order to turn on if turned off or if they run out of battery life.

EDIT: Oh before I forget, there is no Jailbreak as of yet for the 3.1.3 3GS.
 

Intell

macrumors P6
Jan 24, 2010
18,872
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... the MC model is the new boot ROM and the MB model is the older boot ROM. The MC ROM is iBoot-359.3.2 which is not vulnerable to the "24kpwn" exploit.
Well then how am I using a MC untethered jailbroken 3Gs iPhone to post this? Sure I'll admit I could be wrong but logic dictates that B comes before C in line of model numbers. Thus, B is 3G and C is 3Gs. My info comes from past Apple model numbers and apple.com.
 

Stealth Hokie

macrumors newbie
Mar 18, 2010
1
0
3GS uses both MB and MC bootroms

Well then how am I using a MC untethered jailbroken 3Gs iPhone to post this? Sure I'll admit I could be wrong but logic dictates that B comes before C in line of model numbers. Thus, B is 3G and C is 3Gs. My info comes from past Apple model numbers and apple.com.
OK, I previously had a 3GS MC model that was jailbroken under firmware 3.1.2 but it locked up one day and I accidentally upgraded it to firmware 3.13 which screwed me over because this firmware combined with this MC bootrom has not been jailbroken yet. After spending hours trying to find a solution it does not exist unless the phone had it's hash saved on Cydia so you can downgrade to 3.1.2 which I could not after repeated attempts.

I asked a co-worker to swap iphones with me because his was a 3GS MB model with firmware 3.1.2. So I just swapped sim chips and restored both phones. Now I'm happy because I have my jailbroken 3GS iphone with the older bootrom and I'm not going to upgrade to 3.1.3 at all. Also made sure my hash was backed up on Cydia now.

So I've had both MC and MB 3GS models and both were jailbroken but your screwed for now if you have an MC model and upgraded firmware to 3.1.3.

Hope this clears it all up. I sure spent enough time on this.
 

Intell

macrumors P6
Jan 24, 2010
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A pity about your iPhone. But you see mine is a day 1 iPhone that is MC, because of it being a 3Gs, and it has the older bootrom. The MC/MB has nothing to do with the version of the bootrom. The only ways to tell what version you have is via the serial number and by looming when it's in DFU mode.

Also I don't think any 3.1.3 3Gs that doesn't have an older SHSH blob is jailbreakable. Weather it's the new or old bootrom. All iPhone 3G/MB devices are jailbreakable with 3.1.3 becuase they all have the same bootrom as the originial iPhone or G1 iPod Touch. Don't forget the MB/MC is only the model numbers for 3G and 3Gs, nothing else.
 

Bahrovski

macrumors newbie
Original poster
Mar 13, 2010
12
0
Thank you all for your comments...

Obviously, no one knows what does MC/MB designate...

-its not 3G/3GS model... coz there is 3GS with MB on it....
-its not old bootrom/new bootrom.. coz there is new boot with MB and old boot with MC and vice versa...

So what is it then ? lol
I've really searched well on the net and no one really knows what is MB vs MC means in 3GS...

In fact this is only an iPhone thing... coz in all other Apple products the MB/MC code designate the model version.. (ex: ipt 1G/2G/3G)
 

Mlrollin91

macrumors G5
Nov 20, 2008
13,477
8,687
Ventura County
I'm not sure if this helps or confuses this topic even more. I have a week 7, 2010 32GB Black 3GS, of course new bootrom and I have a MB model.
 

Bahrovski

macrumors newbie
Original poster
Mar 13, 2010
12
0
Well then I guess that the MB/MC means nothing at all.
LOL :D

could it possibly be that MB models have some parts that were intended to go to 3G units or have parts from refurbished 3g phones ??? hence the MB (which is the model number of 3G units) ?
 

Intell

macrumors P6
Jan 24, 2010
18,872
368
Inside
They have some recycled parts? Or perhaps older parts that were designed for the 3G? I don't think either of those are the reasons. The parts are too different between the two for that.
 

greggj

macrumors newbie
Apr 27, 2010
1
0
do any of you know than, why on earth is MC model fail with some wifi routers, while MB models are fine on the same one ?
I do feel that it is not just the bootrom that's different to be honest.
 

VulchR

macrumors 68020
Jun 8, 2009
2,329
10,254
Scotland
It's simple. "MB" and "MC" are random designations contrived by engineers at Apple to send those of us with OCD tendencies over the edge. Nothing more, nothing less.
 

TSX

macrumors 68030
Oct 1, 2008
2,610
22
Texas
My 3gS I bought at launch is MB and my friends refurbished (That she bought in October) 3gS is an MC and it has an untethered JB.
 

nurv2600

macrumors member
Aug 28, 2009
31
0
There cannot be a MCxxxLL 3G iPhone. Only the 3Gs have this model number. My week 23 3Gs has MC because it's a 3Gs and that explains the model. And there is no such thing as a MB 3Gs. As that model number is used exclusively by the 3G iPhone. The only thing that is different on some 3Gs iPhones is the last character on the US FCC listing. Some end with an A some end with a B. I think the different listing mean they where made by different companies. I do know that the internals of the two listings are a bit different. The listings do not have anything to do with unlocking or jailbreaking.
I can assure you, my week 26 3GS 32MB black is model MB717LL. (Happily JB'ed with blackra1n on 3.1.2 untethered).
 

mikethebigo

macrumors 68000
May 25, 2009
1,819
147
Yeah, I've got a 3GS 32 gig (black) that starts with MB. It was a pre-order that got delivered on launch day. It's got 3.1.3 though, so I'm still waiting patiently for Spirit to come out. Can't wait to start multitasking and changing themes!

Oh, and mywi is going to be sick :D
 

Intell

macrumors P6
Jan 24, 2010
18,872
368
Inside
Way to go one digging up the old thread. I already said that I was wrong and there is no known difference between the two.