Before performing various actions on your device, we recommend reading this article in full.

As you know, Samsung undertakes to support devices with Android OS for eighteen months (one and a half years), that is, constantly update the operating system. But what to do when this time passes and the smartphone stops receiving official updates? The answer to this question is quite simple - reflash the device, fortunately there are now quite a lot of third-party developers who create unofficial firmware. Today we will talk about how to reflash Samsung Galaxy S2.

What do you need to know?

You only need to download the firmware that is suitable directly for your smartphone (see the end of the article).

What do you need to have for this?

To flash the device, as noted above, you need to have root rights, this is the most important condition. You must have a USB cable. You must also download the firmware file and Gapps (Google Apps - standard applications, such as Google+, Gmail, Goole Play, etc.). It may be needed for the future.

Hi all!
I installed the nightly firmware 20140331.
Should I update the firmware to a new nightly one, or wait for a stable one?

It costs once a week or every 2 weeks.

Vladislav Ivanov

Good afternoon or night! With CyanogenMod 11 firmware running Android 4.4.2, will the Gear 2 watch be compatible with the GT-I9100? Also, is it possible to install Samsung Apps on GT-I9100 with this firmware? The fact is that there is a Gear manager. If this is possible, then how? I’m hitting something like a pea against a wall. Neither a Samsung account can be created nor the Samsung Apps application can be installed.

Good afternoon
I'm trying to flash I9100.
7. Install the recovery - I did everything as written, pressed “START”, but I can’t wait for the “RESET” inscription. This is what hangs on Odin:
Added!!
Odin v.3 engine (ID:6)..
File analysis..
SetupConnection..
Initialization..
Get PIT for mapping..
Firmware update start..
SingleDownload.
zImage
What to do? Please tell me

If I get to step 9, how can I make a backup copy of the current firmware through recovery?

I tried to flash CyanogenMod 10.2 - the same thing
I have I9100XXLS8 firmware installed with Android 4.1.2

I asked!
I skipped step 7, started straight from step 8 and everything worked out!
RESPECT TO THE ADMIN!!!

Flashed Mod11. Everything worked out the first time, I did it as written here. Thanks admin.
One “but” confuses me: every time I turn on the device before loading Android, the screen with information about the phone model lights up and at the same time a yellow triangle appears below, as when loading recovery... Is this intended, or where is my mistake?
There is one more wish for the firmware moderators: the “call back” button after rejecting an incoming call is really missing, as well as such a contact book option as “send contact information via SMS”. The second is rarely needed, but when it comes in handy, it makes life easier.

Good day)

If you have any doubts, read it again!

You have installed the latest official firmware I9100XWLSE with Android 4.1.2...

The question is the following - I have the latest office installed. firmware, only I9100XXMS2 with Android 4.1.2, the phone has absolutely not undergone flashing and everything connected with it, clean as from a store (the phone itself is naturally GT-I9100), so can I follow your instructions for flashing to CyanogenMod 11?
Thank you!

Andrey Raskazov

Thank you very much! Everything went like clockwork!

Yes, you can, probably after writing the article a more recent official version was released.

Sorry, my video call doesn’t work after updating the firmware, what should I do?

Bek Tursunov

Good day.
The phone has custom MIUI V5. To flash CM11, should I do everything strictly point by point? (well, with the exception of rooting and installing custom recovery)

Anatoly Aristov

If something doesn't work, then wait for updates.

Vladislav Ivanov

You can only make wipes and flash cm11

Vladislav Ivanov

I asked! Thank you very much

RESPECT TO THE ADMIN!!

Abdulbosit Abdulahadov

Dear Admins, reply to this message! After uploading the files through one recovery, it changed and through this changed recovery the firmware was not installed in any way, only through the standard one, for clarification, error code 7. Everything installed perfectly (I thought so), but on the first start, all applications that start in automatic mode begin to issue errors. those. The application is stopped, there is no Google Play, applications are installed through Google Play open in the browser, but do not launch. What is the reason? There is no desire to install another firmware since this one, in principle, visually suits me) Thanks in advance.

Good morning. I did the same according to the Cm11 instructions and completed these steps

"- Install PhilZ kernel:

Install zip from sdcard, find the archive PhilZ-cwm6-XWLSW-XEU-5.07.0-signed
- Reboot recovery - advanced -> Reboot recovery

Loading recovery mode

Install KitKat Compatible CWM kernel:
- Install zip from sdcard, find the archive with the KitKat Compatible CWM v.6.0.4.5 kernel
- Reboot recovery - advanced -> Reboot recovery"
As a result, the firmware was crooked, applications in autostart gave an error. I spat and went back to MIUI. But the problem is that now MIUI is slow, the phone freezes, or even turns off. I'm thinking of returning to CM11. How do you advise flashing, you can just throw the firmware and gaps on the phone, make wipes and run calmly through recovery? Do I need to perform the above steps again (including installing kernels)?
Sorry in advance for taking up time)

Anatoly Aristov

Actually, if you already have recovery, then you just need to make wipes and install everything you need)

Vladislav Ivanov

Good day!
I have problems with all google apps. navigation, playmarket, etc., even a google account won’t install it. Is this a gapps problem? I've already tried to reinstall and install versions from other sources, but it's all to no avail. Please tell me how to solve this issue?

The archive contains the official gapps cyanogenmod, the problem may be if you installed the wrong ones.

Did you install http://site/files/firmware/gapps/cyanogenmod/android44x?

Good day! I have the same problem. Installed gapps using this link http://site/files/firmware/gapps/cyanogenmod/android44x
After the firmware, 2 updates appeared, I updated and still have a problem with google applications.

Solution to the problem:
1. After updating the firmware, wipe the Dalvik cache
2. Make a complete wipe and install the firmware again from

Vladislav Ivanov

Hi all! Admin, help me out buddy, I installed everything, everything works, but the problem is like some with: gapps-kk-20140606-signed, the firmware is this: cm-11-20140806-NIGHTLY-i9100 and the services are all Google and the like, a bunch of signs are pouring in all with the Internet linked YouTube, etc. curses and doesn’t work, so I installed this one: gapps-jb-20130813-signed and cleaned the same thing:
AS Vladislav Ivanov wrote 2014-08-07 18:35:07
Solution to the problem:
1. After updating the firmware, do wipe dalvik cache
2. Make a full wipe and install the firmware with these gapps, i.e.: this gapps-kk-20140606-signed
All the same I'm back to this one for now: gapps-kk-20140606-signed WAITING FOR WHAT TO DO, THE REST IS OK) help me brothers... I'm waiting

Please tell me how to turn off broadcast messages, they come every minute... they drive you crazy

Vladimir Lysenko

ZY On the phone I cleared all the checkboxes in the broadcast SMS section

Vladimir Lysenko

Hello. What should I do if the firmware version of I9100XXLPS android is 4.1.2? Recovery mode is completely different.

Kirill Tarassov

Well, now I seem to have messed up and when I turn it on there is an exclamation point and 0 actions, help!

Kirill Tarassov

Hello! I installed this firmware a month ago. Everything seems to be working, but the contacts live their own lives all this time. You get up in the morning and go in, and there are not all 200 contacts, but, for example, 90. If you copy contacts from the phone’s internal memory, you will restore all 200 contacts. For example, a week passes - and once again the number of contacts decreases by a random number. And the worst thing is that new contacts are lost forever!

Maxim Chuprunov

Do you store your contacts in a Google account?

Vladislav Ivanov

I wrote down the phone number of my future employer - now, naturally, his phone number is lost. What to do in such a situation? It turns out that the contact log can no longer be trusted.

Maxim Chuprunov

This is the first time I've heard of such a problem.

Vladislav Ivanov

Admin, would you be so kind and help? Thanks in advance.

Kirill Tarassov

Extract from the rules:
- There is no need to ask a question twice; if you are not answered, it means they are either looking for an answer or don’t know.

Samsung recently released Jelly Bean 4.1.2 OTA update for Galaxy S2 GT I9100. If you haven't received a new one ROM, you can install it manually by reading this guide.

3. Unzip the update files and install Odin on PC.

4. Launch Odin and turn off your smartphone.

5. Reboot into download mode ( download mode).

6. To do this, press and hold the following buttons: Volume Down, Center And Power.

7. Connect S2 to a PC using a USB cable.

8. Go to Odin. Program section ID:COM should be yellow or blue, and you should see a message with the text " added".

9. Otherwise, you must close one, disconnect the smartphone from the PC, reinstall the drivers and try again.

10.B Odin select " PDA" and find .tar file.

11. If the update package contains more files, then for " C.S.C."you must choose C.S.C. file for " PHONE" - Modem file for " PIT" - .pit file.

13. After the process is completed Odin should display a message with the text " pass".

14. Now you can restart your smartphone by first disconnecting it from the PC.

15. If during installation of updates Odin frozen, you must close the program, disable USB cable, reboot S2, reinstall the drivers and repeat the entire procedure from the very beginning.

16. If the smartphone freezes when loading, then you must turn it off, boot into mode recovery, choose " wipe data factory reset" And " wipe cache partition", followed by - "+++ go back+++" and " reboot system now" and try again.

That's all. Now you know how to install a new version of the operating system for the Galaxy S2.

The next test subject, Samsung GT-I9100, had to be updated to the latest official firmware. Unfortunately, the latest official version for this device is based on Android 4.1.2, for the most part the firmware is excellent, not counting the fact that the manufacturer loves to cram branded “trash” into them. Flashing the official firmware is not that difficult, all you need is:

1. Charge the device to capacity, that is, 100%, do not neglect the charge, in the firmware mode it eats up the charge in buckets;
2. Install drivers for Samsung's; they are available in Kies, but they are also available separately;
3. You will need an Odin flasher;
4. Well, the firmware itself;

Having installed the drivers, turn off the phone, press the volume down button, the center button ok and turn it on, having received a warning, press up, the phone goes into download mode. You should see a picture like this

For single-file firmware

The ID:COM item should display 0: in my case 0: yours may be different. The Auto Reboot and F.Reset Time checkboxes must be checked, then use the PDA button to select our single-file firmware. Click Start. At the end of the process above 0: the inscription on a green background PASS! in the All threads completed log. This indicates that the firmware is complete, your device will reboot and turn on, but the data will remain on the phone.

This method is recommended only for updating the official firmware version!!! Do not use single-file firmware to downgrade or upgrade, Also not recommended for transitions from custom firmware to stock (official) firmware

For three-file firmware

Press the PDA button, select the file CODE_XXXX, then select Phone, select MODEM_XXXX, CSC select the file CSC_XXXX, (where XXXX is the phone model in this case I9100) then click Start

Instructions for installing the official single-file firmware on the Samsung Galaxy S2 (GT-I910x).

Drivers and programs

Attention!

Installation instructions

Unpack the downloaded archive into a folder with Odin PC for convenience. The file in the ".tar" or ".tar.md5" format must be left, but the "SS_DL.dll" can be deleted.

Reset your device.
To do this, go to the settings tab " Accounts" to the section " Archive and reset", select the item " Reset device" and press the button " Delete everything" The phone will reboot.

Run Odin PC as administrator.

Put your device into download mode ( Download Mode).
To do this, you need to simultaneously hold down the Volume Down key, the Home button and the Power button. Then wait until the phone reboots and agree to the warning by pressing the Volume Up key.

In this state, connect the smartphone to the computer. In Odin the message “ COM».

Click on the “ AP» and select the TAR firmware archive.

Items " Auto Reboot" And " F.Reset Time" must be activated, A " Re-Partition"if active - must be disabled.

Click on the “ Start" The firmware installation process will begin.

about the end of the operation, if everything was successful, the message “All threads completed. (succeed 1 / failed 0)". The phone must be restarted manually by holding down the power button until the screen turns off. It may take up to 5 minutes for your device to boot up initially.
ATTENTION!
If the device does not boot for a long time or the data has not been reset, it must be performed from recovery.
To do this, you need to simultaneously hold down the Volume Up key, the Home button and the Power button. After downloading, select " Wipe data/Factory reset", and then - " Reboot system now" If after these steps the device also freezes when loading, you need to reflash it again.