How can I know if it´s stock? - Galaxy S III Q&A, Help & Troubleshooting

Hi guys,
I´ve just bought a second hand GS3 and I cannot update it. I thought it was because it was rooted but then I tried a temp unroot (rootkeeper) and it didn´t work. So I´m not so sure if my phone is fully stock. How can i find out?
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Status - device status. Should be "normal"

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Device status says "modified" and serial number says 000000000000000000000000000.
Would you happen to know where can I get a stock kernel for this phone? As a matter of fact, how do I find out WHICH IS my stock kernel?

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not kernel, you need a whole ROM. get one from sammobile

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Really? Oh no....this means having to reconfigure my entire phone again
So I just type GT-i9300 on sammobile and download the rom? Or do I type the baseband, or what?

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rawfa said:
Device status says "modified" and serial number says 000000000000000000000000000.
Would you happen to know where can I get a stock kernel for this phone? As a matter of fact, how do I find out WHICH IS my stock kernel?
Click to expand...
Click to collapse
The Imei seems to be scratched up too. May you will have problems with warranty
Gesendet von meinem GT-I9300 mit Tapatalk 2

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I don´t care about the warranty. I just want to get back to stock but I don´t even know how to begin looking for what rom is my stock rom...

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UltrasFrankfurt said:
The Imei seems to be scratched up too. May you will have problems with warranty
Gesendet von meinem GT-I9300 mit Tapatalk 2
Click to expand...
Click to collapse
serial number, not imei
---------- Post added at 10:36 PM ---------- Previous post was at 10:35 PM ----------
rawfa said:
I don´t care about the warranty. I just want to get back to stock but I don´t even know how to begin looking for what rom is my stock rom...
Click to expand...
Click to collapse
flash latest i9300 stock rom

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So, as long as it´s GT-i9300 I can download ANY rom? I´m downloading Android 4.1.2 I9300XXELL5_I9300VFGELL1_TCL.zip | 901.3 MB. Should this be ok?

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you can choose your csc from the csc list in General

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Ok. Then I guess the one I´m downloading won´t work for me as I´ve just checked and:
AP: i9300xxale8
cp: i9300bole5
csc: i9300tnlle3

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you can change csc later, but that's not required

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So the one i´m downloading should be fine then? Sorry for the question massacre but I don´t want to brick my phone.

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you won't brick your phone, you may have some network issues, but that's unlikely. and if you do, just change the csc
---------- Post added at 10:56 PM ---------- Previous post was at 10:56 PM ----------
just FYI, ELL5 is not the latest version. ELLA is

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Thanks. I´ve just canceled the other download...I´ll have to wait 28min to be able to download ELLA. I´ll let you guys know latter.

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I´ve flashed the ELLA rom and it worked perfectly. It didn´t delete my data or configuration. Everything is perfect but I´m having an issue.
Whenever I try to make a call it tells me I´m not registered on a network. I went to "Mobile Networks", "Network Operators" and selected my carrier but I keep getting the same msg whenever I try to make a call.

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rawfa said:
I´ve flashed the ELLA rom and it worked perfectly. It didn´t delete my data or configuration. Everything is perfect but I´m having an issue.
Whenever I try to make a call it tells me I´m not registered on a network. I went to "Mobile Networks", "Network Operators" and selected my carrier but I keep getting the same msg whenever I try to make a call.
Click to expand...
Click to collapse
You are posting the same question twice .
jje

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rawfa said:
I´ve flashed the ELLA rom and it worked perfectly. It didn´t delete my data or configuration. Everything is perfect but I´m having an issue.
Whenever I try to make a call it tells me I´m not registered on a network. I went to "Mobile Networks", "Network Operators" and selected my carrier but I keep getting the same msg whenever I try to make a call.
Click to expand...
Click to collapse
I just knew.. Phone somehow is stolen or smth is wrong with it.. Thats why u didnt have serial number in the first place.. u must have got ur phone preety cheap..
Sent from my GT-I9300 using xda premium

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Imei blocked perhaps if phone was a stolen one.

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CHEVYbarracuda1 said:
I just knew.. Phone somehow is stolen or smth is wrong with it.. Thats why u didnt have serial number in the first place.. u must have got ur phone preety cheap..
Sent from my GT-I9300 using xda premium
Click to expand...
Click to collapse
I traded it for my HTC One X...had I known this before I would have kept it. I´ve managed to fix everything but I do not endorse the transaction of stolen goods.