[Q] Firmware LT18a to LT15a ? - Xperia Arc Q&A, Help & Troubleshooting

good staff
Yesterday I was updating my arc via wotan, and some people told me that the firmware works on the arc s arc normally.
I even upgraded to version ultyima and was normal.
but wondered if changes anything, if it can be harmful or not?

you wont access 3G.... the LT18a uses american 3g bands (850/1900) wether LT15 runs Euro 3g bands (900/2100)..
Let me know if you can get 3G after doing this.

Related

ARC 3G compatibility

i bought this ARC from hongkong and now im in canada
but i never found the 3G network, and then i go to Fido store
i changed a SIM card.But nothing change.
and finally i found the problem: My Lt15i is only support UMTS/HSPA 900/2100
And i wanna to know if i can fix by change CDA or the driver of baseband?
no way to change the band compatibility... it's hardware related. your best bet is to sell that one and buy the arc from rogers
I had the same issue. I did receive the LT15i so it only works on EDGE.
eBAY is going to refund the money when I return the phone
I will then buy a LT15a which will work on our bands.
I'm amazed you don't know this. You buy a Hong Kong phone or a European phone, it is not 3G Canada. Hey, this is XDA. This is where they're supposed to know.
Here's a pro tip regarding Sony Ericsson phones.
last letter a = North American GSM frequencies (850/1900/2100)
last letter i = Global GSM frequencies (900/1800/2100)
last letter c = Chinese GSM frequencies and may be TD-SCDMA​
LT15a is Xperia Arc for AT&T/Rogers/Fido/Bell/Telus frequencies.
LT15i is Xperia Arc for Europe, Asia, Africa and Australia GSM frequencies.
SO-01C is Xperia Arc for Japan.
Is there an LT15c?
What about Brazil?
TWiTCommander said:
What about Brazil?
Click to expand...
Click to collapse
Brazil uses the "a" version.
I'm just wondering to the OP what did you do?
I realize I have the same problem.
I too bought an arc in hong kong. Actually it was meant for my mother, but I traded her with my x10.
My arc LT15i network only works on edge.
I think it's funny how my x10 works great in hong kong while the arc can't connect to 3g here.
Is there a service provider that would be in that same frequency?
I'm currently with fido.
[Edit] Excuse me for reviving dead post.
Switch to LT15a_3.0.1.A.0.145_NAM
maybe works
Here in Brazil, works with LT15a
But works LT15i
But if 3G is hardware problem, I'm sorry!
Greetings
Do not buy a internation version phone unless u clearly know the phone 3g band. It is because most of the international version wont work in most of the carrier in north america. I believe it is because frequency 850 only used in north america, so they have to make a "special" edition for north america carrier.
Also you can't change the baseband to get the 3g network, since it is hardware problem, not software.

different firmware will work?

i asked so much and i promise it will be my last time
im about to root my phone (Xperia arc LT15a) with LT15i world generic firmware,
and i saw this thread - http://forum.xda-developers.com/showthread.php?t=1116325 that shows me that my carrier radio ability wont work with LT15i because it uses 850 and 2100 (http://www.mobileworldlive.com/maps/network.php?cid=2017&cname=Israel - Pelephone Communications Ltd. (Pelephone)).
any way, should il be worry or can i do it with no problems? my only question

[Q] Can Arc use the 3G network of T-mobile?

Does the network frequency of Arc fit T-mobile? I can use 3G in China, but only GPRS available here in America with T-mobile network.
Anyone can help me?
Thanks
What is your phone code number, in America it is Lt15a, a is American, if you use i, this can be a problem maybe, they have different frequence like you said, first you can ask this to Sony Ericsson i guess?

[Q] will lt18i's 3g work on usa if i dump an lt18a rom in it?

I saw alsaqr's ealier post that he unlocked japanese version of lt15i and dumped an lt15a rom into it and he made it work on AT&T's 3g network on April which lt15a hasn't been out yet at April.
Therefore i was wondering if i buy unlocked lt18i and do exactly what alsapr did, which dump an lt18a rom to unlocked lt18i device, will it's 3g work on AT&T?
I know there is lt15a is out but i want to get white version and would be nice to have little bit better version than original one since global version is out already.
or should i just buy an lt15a since there isn't too much difference other than 1.4Ghz processor and 2D&3D panorama camera function.
(and proceeder device is about $50 cheaper)
Can anyone help me out..?
Dumping an 'A' rom onto 'i' hardware wont help, mate. People with AT&T usually dump 'i' roms onto their 'A' hardware (that supports AT&T 850/1900 MHz UMTS) just to get faster updates and it doesn't change 3G bands (HW can't be altered by SW). So in a nutshell, hardware version is the only concern when you're worried about your carrier's 3G compatibility. You can flash any kind of rom ('a', 'i', 'custom') onto an 'A' hardware and I'm pretty sure it'll support ATT UMTS. I'm actually waiting for LT18A to come out as well
By the way, I already have an Arc (LT15A). I need another phone anyway, so I'll get an Arc S. But you should check the link
.xperiablog.net/2011/10/17/xperia-arc-s-review-benchmarks-galore/
it'll help you decide which one you need. electronicsshowplace.com is selling LT15A for an incredible $370 price.
.electronicsshowplace.com/advanced_search_result.php?osCsid=mnrhcu9o6bg7a7gm71e3ja0le2&search_in_description=1&keywords=xperia&pfrom=&pto=&categories_id=3710&x=0&y=0
Hope this helps.
---------- Post added at 03:31 AM ---------- Previous post was at 03:13 AM ----------
Beside the processor and camera features, I think there is another major upgrade on Arc S- HSPDA has been boosted to 14mbps (from Arc's 7 mbps). So an LT18A might get better data speed on ATT 3.5G network (they call it 4G though!) . I've an ATT xperia play 4G. Its data speed is a little faster than my LT15A. But if you are going to use wifi most of the times - don't even bother about this difference.

Change in Lt15i Lt15a? Possible or not?

My ARC is Lt15i, I can change it to Lt15a? If yes, how should I do?
In my country, the official version is Lt15a (here, the 3G is 850 and 2100 MHz) and Lt15i only works on 2100 Mhz here, I got Lt15i imported in a negotiation.
I've been reading that the frequency is related to hardware, but I read in topics of April, I wonder if something has changed in recent months, is there any way to change that ?
Thank you for your attention.
Hello, what you ask can not. Simply because it's a hardware issue. If your team is Lt15i, there is no way to convert it to Lt15a.
Well, you CAN update the firmware to LT15a or LT15i, they are interchangeable, but they will not mod any hardware, thats for sure. I dont think it would change anything for you in your situation.

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