yashsingh1/xdaforums huggingface dataset:
[Nexus S Android Development] Blaiz:
hi all you great people put here on XDA, I have found my self in a biut of a pickle. My phone was constantly going back and forth from Gprs to Edge to 3G to H and i thought i might try to flash a new radio so i gave the new UCKE1 and since flashing i now not only have no signal but my network connection icon is showing the phone is "R" roaming. Any idea how i can at least get back to where it was?

please...

tryed the

How to retrieve 3G Data Connection

Method 1 and 2

also tryed changing the

HSDPA Tweak (Higher/Faster Data Connection Speed)

ro.ril.hsxpa=2

ro.ril.gprsclass=12

ro.ril.hsdpa.category=16

ro.ril.hsupa.category=8

I have reflashed latest CM7 nightly and completely wiped everything and still it goes straight into roaming . I'm afraid it may have somehtin to do with the efs files i have backups but I havent tryed restoring those yet, I'm a bit concered to do that without some advice as i havent seen this roaming issue after search for a while.

some phone info in case it helps

Rom CM7 nightly latest

Kernel Netarchy 1.3.5

Radio now UCKD1

Nexus S I9020a

cheers

but nothing seems to help :(
[Nexus S Android Development] thecoogster:
Restore the efs folder with root explorer and reboot, that worked for me

Sent from my Nexus S powered by Trinity
[Nexus S Android Development] Blaiz:
I believe my efs folder was wiped in earlier flashing before it was ever properly backed up. I believe i was just restoring an incorrect backup, is there a decent guide in getting the efs folder back anywhere?

cheers
[Nexus S Android Development] kavyt:
There is currently no way to get it back
[Nexus S Android Development] rentaric:
If you don't have a backup folder you are out of luck. Need to jtag it or any other hardware mod. IMEI restoring/changing is, as a sidenote, illegal in some countries.
[Nexus S Android Development] JuliusCes:
I am having issues switching back and forth from 2g to 3g speeds. I have poor reception at work so I need the 2g to save battery life.

I have the the i9020a phone

Rom: superaosp 8.6

Bootloader: xka3

Radio: kd1 although it says on phone no dgsxxkd1 instead of i9020xxkd1.

The phone works fine on 3g but as soon as I switch back to 2g I lose data and it becomes hard to switch back to 3g data without doing the 3g retrieval trick. The same problem happens with the uckd1 radio.

Please help. Could this be an issue with the Rom, corrupt efs, or something else?

Thanks
[Nexus S Android Development] Blaiz:
Kavyt thanks for your response. Do you believe the symptoms of my phone would indicate a corrupt or missing efs folder? and your reply was quite succinct and unambiguous is there anyone that has any information regarding this issue possible fixes or is this going to take my phone on a trip back to the manufacturer? Is there a definitive way to know that this is surely the issue?

Thanks for your reply.

Blaiz

I can connect to the network here as long as i select National data raoming, however no data connection becomes enabled, all settings as far as APNs and Data enabled options i have toggles back and forth and still no data connection, Do these sound like the symptoms of a bad or missing efs folder files?
[Nexus S Android Development] :
Can you make calls? Chances are your IMEI is fine. Dial *#06# and check the output matches the sticker behind your battery.

Backup your EFS folder again before you go about making any further changes. To restore your data connection, I'm sure that advice has already been given in this thread.
[Nexus S Android Development] Blaiz:
bedalus it would appear that the IMEI numbers do not match:( any idea on next step?
[Nexus S Android Development] tevil:
from what ive read there is no fix, just send it back to samsung. if you have insurance on the phone just smash it and get a new one.

dont you have a nandoird/clockwork image of the phone you can dump back on it?
[Nexus S Android Development] Blaiz:
sure i have old nandroids somewhere. will that work?
[Nexus S Android Development] tevil:
would love to know, give it a try lol

me and my buddy were having this discussion earlier, you can settle it for us.

on a side note speaking about EFS. next to the E1 radio it says to save you efs, c an someone explain why?

I may be going back to that radio and i have my EFS but would love to know why i need it

thanks
[Nexus S Android Development] :
I've tried two separate Samsung repair centres, with no luck, and it is now at Samsung's main repair centre in Glasgow. I doubt they will be able to fix it. Perhaps follow the insurance route.
[Nexus S Android Development] thecoogster:
What did you tell them if you don't mind me asking?

Sent from my Nexus S powered by Trinity
[Nexus S Android Development] :
Sounds unbelievable, but I told the truth! No-one's asked me for any money yet either. I'll be very impressed if this is sorted out under manufacturer's warranty, especially since it's a pre-owned phone I got off ebay.

I said to the first shop

1) I've corrupted my efs folder by flashing a radio

2) I've wiped my efs folder by mis-understanding some advice I read (in this thread)

3) I've flashed a stock ROM and locked-unlocked-locked my phone back to stock

They said they couldn't fix it (after downloading secret software from samsung)

I then sent an email to samsung about what had happened. They replied and sent me to CarPhone Warehouse Liverpool.

At the CPW Liverpool I said the same three things, and that

1) The first shop couldn't fix it

2) I got an email from samsung saying I should bring it here instead

He confirmed that it would be a very difficult fix, or probably impossible to do in the shop, and it would then be sent to samsung. I asked them if it would be better to send it to samsung myself instead of through their shop. He said it would be, as I could show my ebay receipt as proof of ownership. He checked the IMEI sticker and confirmed it was a UK phone bought originally from CPW.

I phoned samsung, and after 30 minutes of explaining about the shops and the emails, she agreed I could send it in, and set up a service request number. I posted it off and I've been following it on their support website. Apparently, my phone has been "assigned to an engineer." The woman on the phone included a description of the problem on the service sheet.

'The phone's IMEI was wrong. He took it to a service centre, they told him the efs was corrupted.'

That's not exactly what I told her. I can only assume that she was trying to do me a favour by making me appear less culpable.
[Nexus S Android Development] thecoogster:
Good luck, hope you get sorted.

Sent from my Nexus S powered by Trinity
[Nexus S Android Development] XxSilent22xX:
Where is the md5 for the radio's?

Sent from my Nexus S
[Nexus S Android Development] window7:
How to extract the md5 sum? :)
[Nexus S Android Development] ellesshoo:
This.. Radio images of all things really should have their MD5's posted next to the download link in the OP.
[Nexus S Android Development] Patrick615:
Window7, i am wondering that do you experience poor signal using I9023XXXKD1? Because i using Miui 1.8.12 - Brainmaster's tweaked version as well. My phone's signal is weak at home. Using Pete's Kernel. Just wondering what is wrong with my phone.

Edit: Sometimes i get disconnected as well. I wonder what is wrong.
[Nexus S Android Development] window7:
Thanks, I never knew that md5 is that important. I am doing it now :)
[Nexus S Android Development] ellesshoo:
No worries. It just allows users to verify that they're download is exactly the same as the file on the server and didn't get a corrupted download or partial download.
[Nexus S Android Development] window7:
Australia VODAFONE and 3 network are SUUCKKKKKKKSSS!!!!!!!!!!!!:eek::eek::eek:

As usual, 2G (EGDE) connection are better than 3G (HSDPA). Haha.

But seriously, KD1 and KB3, make no difference for Australia.

What can really improve our signal in Australia is using the 850mHz network connection, which Telstra is using now.

Vodafone is trying to upgrade it too now. Too bad our Nexus S doesnt support 850mHz, only a few phone support 850mHz. But Telstra Nexus S does support 850Mhz :)

Which part of Australia are you in? I am in Brisbane.
[Nexus S Android Development] window7:
MD5 sum is up on the 3rd post :p
[Nexus S Android Development] JuliusCes:
It seems like I can only get 3g connectivity here in Morocco, which uses the same bands as Europe and more precisely France. Whenever I try to connect to 2g it either fails to connect (unknown data error) or it says it is connected but it is not working (both phone and data do not work) and people can't even reach me by phone. I do not want to use 3g all the time as it is a battery killer in poor 3g areas.

I have the i9020a phone with the following specs

Kba3 bootloader

Uckd1 radio

Superaosp 8.6 rom.

What can I do to be able to switch back and forth between 2g and 3g easily.

Any help or advice would be greatly appreciated. As I have tried many things. Stock Rom, the kd1 radio, different combinations of radios and phone bands in the testing mode.

Is this a radio issue or a rom issue or worst a hw issue?

Cheers

JuliusCes
[Nexus S Android Development] sTiCkY88:
why doesnt kb1 work with 2.3.4 :(

i tried flashing but it says unknown baseband...

i remember i had excellent battery life with KB1
[Nexus S Android Development] YourMainDude:
=\ im in the same boat... did What u did. Has anyone helped you?
[Nexus S Android Development] window7:
Hold on guys. Can you tell me again what's the main problem? You mean, you flash the KB3 and it doesnt work?

Does it mention "writing radio" at CWM log?
[Nexus S Android Development] theallian:
whats the difference between jk1/jk8 and kb3/kd1
[Nexus S Android Development] JuliusCes:
@window7

I have an att phone. If I want the phone and data signal (both on 2g and 3g networks) for European bands then what radio should I install?
[Nexus S Android Development] ElCamino:
I am using AT&T with the Nexus S and I have flashed KB3 radio and switches so far only from H data, to 3G data speed. I'm in the U.S.
[Nexus S Android Development] rentaric:
You can't get European 3G on an AT&T device, need a T-Mobile one. Edge will work with any At&t baseband.
[Nexus S Android Development] JuliusCes:
I beg to differ, I have been getting 3g speeds with my phone in Morocco which uses the same basebands as Europe. The problem is slightly different. Once I'm on 3g speeds it's hard for me to get back to 2g speeds.

I have to access phone information through #*#*4636*#*# and then switch to GSM only. And sometimes that fails to get data working so I have to turn radio off and then back on. More importantly sometimes I would lose 2g and my phone becomes an itouch. Meaning no phone signal and no way for me to know until I check phone information data.

But recently with MIUI Brainmaster 's rom v 1.8.12 phone signal had not Been dropping as much. I am definitely thinking that this is a software issue, maybe kernel or radio.

One question is there an algorithm that tells the phone which signal to look for first? Maybe if I tell the phone to look for a GSM signal instead of CDMA, that might solve some of my issues.

Edit: here are my dl and ul speeds using speedtest and I have a 1.8 mbps data plan.

DL 933 kbps

UL 361 KBPS

Ping 211 ms
[Nexus S Android Development] noxlord:
I was doing some testing on my I9020A with the stock UCKD1 radio and I was totally trown off by the high ping and ridiculously slow speeds. I came across this tread and decided to flash the XXKD1 radio. I use brainmaster's MIUI 1.8.19 rom on Rogers network in Canada.

Bottom 2 tests are with UCKD1 and the other ones are from XXKD1.

The improvements are like night and day.
[Nexus S Android Development] turagaramki:
hi i bought my Nexus S from best buy (I9020T) 4 months back. i am in india tying to use 3G data, but my mobile is not able to capture the 3G signal at all :(. When i checked with the mobile network people they are saying that there is some thing wrong with my mobile that is why i am not able to receive 3G connection. I have tried all like *#*#4636#*#* etc... but not much help. after seeing this post i have downloaded xxKD1 and XXKB3 basebands and tried to flash both the zip file are giving me an error verification failed. do i have to have rooted phone to flash a new baseband radio? please help me

some one say that i need to flash i9023 with KD1 baseband that it work, Can i Flash I9023withKD1 directly or not Please help me in this regard with little detailed explanation

here are my phone details

Android version 2.3.4 (stock 2.3 ->2.3.3 ->2.3.4)

Baseband version I9020XXKD1

Kernel version 2.6.35.7-ge382d80 android- build@apa28#1

Build number GRJ22

Thanks & regards

T. Sriramakrishna
[Nexus S Android Development] kavyt:
Does your Imei end with 4000?

What rom are you using?
[Nexus S Android Development] XxSilent22xX:
DO NOT flash a radio from recovery use fastboot instead alot safer and it will reject the radio if anything is wrong with it, also make sure your flashing the right radio to the right phone model. find your model on the back of your phone under the battery cover and download the correct radio.img and check the hash to make sure its right and flash.
[Nexus S Android Development] turagaramki:
hi my phone is not rooted so i dont have any custom ROM and i am trying to flash the radio downloaded from android recovery manager only. and

my IMEI number is MOD Edit: IMEI Removed for user safety.

Please help me in getting 3G signal
[Nexus S Android Development] willverduzco:
Removed the IMEI for your own safety. It's not good to post these things publicly.
[Nexus S Android Development] turagaramki:
Thank yiu very much
[Nexus S Android Development] ellesshoo:
Anyone have a problem with the KD1 radios where your search button (the capacitive button on the bottom) is repeatedly triggered. It's definitely the radio since it never happens on any of the KB# radios. Is there a fix. I'm on a 9020A if that helps.
[Nexus S Android Development] viper2g1:
anyone have input on the best radio for an att user in northern California?
[Nexus S Android Development] nonameduck:
I doubt it's the radio. I had this problem with the default radio on my i9020a and still occasionally have it on KD1. I also have a CyanogenMod nightly installed with v5.5 of the Matr1x kernel.

I'm in San Jose, CA. KD1 works great for me. I usually get at least 3000kbps down and 1000kbps up.
[Nexus S Android Development] kavyt:
What carrier are you on?

do you have proper APN settings for your carrier?

LOL @ posting your IMEI, just wanted to know if it ended in 4000 didnt need to know the rest :) If it ends in 4000 it means your efs folder is gonzo and "some" carriers block generic IMEI numbers from their networks.
[Nexus S Android Development] sTiCkY88:
yes.. the zip i downloaded (KB1) was aborted while installing at cwm.. lol..

anyway it worked for me now.. i replaced the radio.img file with one from another from from long ago.. seems like it's the radio.img file inside that doesnt work..
[Nexus S Android Development] turagaramki:
Hi my carrier is Airtel

And my IMEI number doesnot end with 4000, does that mean that i can get away with this 3G problem? if so please let me know how
[Nexus S Android Development] kavyt:
Its good that your IMEI hasn't been reset, so you know your carrier is not blocking you.

If my memory serves me Airtel works on both GSM 900 and 1800.

The Nexus is Quad-band GSM: 850, 900, 1800, 1900 & Tri-band HSPA: 900, 2100, 1700 (depending on what version you have).

Do you have any data working at all?
[Nexus S Android Development] turagaramki:
Hi thank you for your reply I am able to browse with 2G so data is coming and when I did activated 3G I am able to receive but very momentarily and always loss of signal :(, so what should I do ?
[Nexus S Android Development] ellesshoo:
It's triggered in low reception / network type change situations. It's definitely related to this scenario, a quick google search brings up a ton of posts that have narrowed it to this. Its never happened to me on KB3 but happens often on UKD1 and XKD1.
[Nexus S Android Development] JuliusCes:
I have switched to UCKE1 and so far this has been a better phone and internet experience on NS. Switch back and forth between 2g 3g is good and no loss of data connectivity on 3g or 2g. More importantly no loss of voice on 2g which I was experiencing on UCKD1. You might want to try it. And I have tried alot KB3, KB1, KD1.
[Nexus S Android Development] :
Will my phone be returning to me IMEI restored at no personal cost to me?

From Samsung Service Tracking website:

Service Status history

1	15.08.2011	Assigned to Service Center to ASC

2	15.08.2011	Acknowledge(ASC)

3	15.08.2011	Acknowledge(ASC)

4	17.08.2011	Acknowledge(ASC)

5	17.08.2011	Engineer Assigned

6	18.08.2011	Pending

7	19.08.2011	Pending

8	20.08.2011	Pending

9	21.08.2011	Pending

10	22.08.2011	Pending

11	23.08.2011	Pending

12	24.08.2011	Pending

13	24.08.2011	Delivery in Progress

Will update when arrived.
[Nexus S Android Development] :
Bloody Hell, they did it! IMEI restored, cost me nothing but postage and a bit of heartache! (missed my phone)
[Nexus S Android Development] window7:
Can you post a thread in General and link it here about the whole process and how to do it? :p:D
[Nexus S Android Development] :
I'll post in the general section, but I've got no idea what the engineers actually did. It'll be their address / phone number I suppose.

I'd heard that it was not even possible to restore, but evidently, it is.
[Nexus S Android Development] window7:
It is possible. But only Samsung able to do it with their specialized software, which no one know except Samsung engineer :D
[Nexus S Android Development] :
These people are contracted out by Samsung, but they will accept walk-in repairs, and postal. Here is my guide:

http://xdaforums.com/showthread.php?p=16976617#post16976617

(It's not really a guide to be honest, it's an address fleshed out by some epic drama.)
[Nexus S Android Development] Kristoferallen:
Okay, my phone's mobile network hasn't been working since it randomly stopped last night. I checked and my IMEI is the same as on the box so nothing has changed. Randomly every few minutes, it will get on Edge for 5 seconds and then go back to having no mobile data. I have played around in the hidden phone menu and I've flashed KB3 and KD1 multiple times. The phone part still works, just not the data. I was on the phone with T-mobile for 45 minutes. I am not sure what is going on all of a sudden. I've also flashed multiple roms so that's not an issue. Was wondering if anyone knew of a possible situation of why it won't connect to the mobile network all of a sudden. :confused:
[Nexus S Android Development] Kristoferallen:
Well never mind. I flashed a rom from MIUI android and somehow everything is back to normal. That didn't happen with the cyanogenmod rom I tried or the one from MIUI.us. Kind of weird so I have no idea what happened.
[Nexus S Android Development] jcrompton:
I haven't been using the Nexus S for a while since I have an SG2 but my daughter is carrying it now. I can confirm that the multiple triggering issue is definitely the radio !!

I reported this experience months ago.

If you try the other radio mentioned in the post after this quoted post please let us know if it works!
[Nexus S Android Development] atrixboy:
I had issues flashing images, radio-data-system with certain downloads.My fix was fastboot unlocking the bl and fastboot flashing the images. Haven't had an issue since. Just make sure you md5 ALL images before you flash to help eliminate chances of corruption as you can now flash almost anything with little to no checks and balances
[Nexus S Android Development] window7:
Once again, a reminder to all of you, please check the MD5 sum before you flash it. Everything is on the 3rd post on page 1.

Or you can click here too MD5 SUM CHECKER AND DOWNLOAD

THanks :D
[Nexus S Android Development] Neurotica:
This might be a noob question, but does flashing any of these radios affect WIFI?

I use my NS with wifi only for

data. I was initially on KB1. I just flashed KB3.

Running 2.3.4.
[Nexus S Android Development] :
Where do I find, which model I have (I9020A, I9020T)???? In recovery-mode it show's only (i9020). I bought it as "free" device.
[Nexus S Android Development] window7:
Pull out your battery, and check the details :D
[Nexus S Android Development] :
GT-i9020 - and now? Do I have an I9020A or an I9020T????
[Nexus S Android Development] Neurotica:
Lol! My phone says the same. It is assumed that you have the GT-I0920T. This info can actually be found here.
[Nexus S Android Development] :
Ah, okay! Thank you!!!!
[Nexus S Android Development] rentaric:
If 3G works for you in Germany you got an i9020T.
[Nexus S Android Development] :
Yes, 3G works...

Welches Radio hast du genommen? Hab das KD1, hab aber teilweise schlechten Empfang.
[Nexus S Android Development] rentaric:
I'm using the KD1 as well and I got full bars everywhere but inside buildings (usually full bars Edge, 2 bars 3G/H+). If you're having trouble using KD1 you can always get an older radio from here, http://xdaforums.com/showthread.php?t=1116884
[Nexus S Android Development] viper2g1:
I need some advice, I have the I9020A in north California. I am in a area that has very bad 3g reception. At the best its 2 bars "H". The radio changes to full bars of edge often. What radio should I use in this situation? My battery stats show very high cell standby. Also should I change my setting on*#*#4636#*#*? I am on whatever is default now. Please help me get better battery life and some descent reception!!
[Nexus S Android Development] iLovPieNCake:
Reporting my Test from South Side of Chicago

I kept the testing environment very similar each time with very little change

T-Mobile Original Nexus S 9020t

KB1 Radio

1645kbps 1024kbps 171ms(I had a test fail right before this one)

2093kbps 670kbps 155ms

1880kbps 901kbps 175ms

KD1 Radio(I was using this one, but flashed KB3 then this back)

2407kbps 131kbps 160ms

1776kbps 171kbps 159ms

1402kbps 252kbps 146ms

KB3 Radio

2581kbps 796kbps 188ms

1953kbps 462kbps 158ms

2479kbps 339kbps 186ms

None of these radios have the HDSPA Tweak. For the short time I used the KB3 radio and from what I remember in the past. The KB3 seems faster, more stable and better signal.

I'm sticking to the KB3.
[Nexus S Android Development] droidance:
Can I flash UCKD1 on Nexus S T-Mobile (i9020t)?

My signals are very poor in many places and some buildings in school, I only can call 911 (emergency call only). I think T-Mobile is only doing that.. while other carrier works fine.

I'm getting two bars in my room and it's pretty crowded area. I used to live on the 6th floor dormitory and I used to get full bars and now I'm on 12th and I get 2-full bars.

Not sure if it's because of high floor, but back when I used to live on the 15th floor (different place), I always got full bars.

And I get Edge connection from time to time as well.
[Nexus S Android Development] steve.garon:
I'd recommend UCKD1 only for ATT version...