How to Flash Android 4.1.2 ZNUAND1 on Galaxy S Duos GT-S7562C

Galaxy S Duos GT-S7562C can be upgraded to Android 4.1.2. This way, your smartphone joins the devices that are already experiencing new stuff!

Your Samsung S7562C is the model we recommend for this upgrade guide. This is because the ZNUAND1 official firmware was launched for it last month. Using a phone whose name differs from this one will damage it. Created for the Chinese version of your device, the firmware we’ll use now delivers a wealth of novelties. They are all presented in detail below.

As promised, here are the goodies an Jelly Bean 4.1.2 comes with. This new OS version sports a new keyboard and automatic adjustment for the size of widgets. Not only these two are delivered. More to come next, such as all share, pop up play and a fixed frame of 60 fps. This next group contains free style widget, triple buffering and mini apps. Moving on, the upgrade deals with extended Vsync timing and Google Now. You’ll also be surprised by touch anticipation, group cast and sync and connect email updates.

The firmware used for your phone’s update procedure doesn’t let you use KIES. Which means that, if your device comes with stock ROM, you’ll get to use an over-the-air (OTA) method. But should your handset not be installed with this ROM, you can get an update with this tutorial.

Your rooted smartphone will lose that root access and its system partition after the upgrade. Its data and internal / external SD cards will not see the same damage.Galaxy-S-Duos-GT-S7562C


Our requirements look like this:

  • a standard backup must be generated;
  • perform a full NANDroid backup (via this guide) when you’re done with the standard one;
  • the battery of your Galaxy S Duos GT-S7562C has to be charged should it display low power levels;
  • deactivate the handset’s security programs;
  • deactivate, also, the ones running on your laptop;
  • the OS featured on the laptop must be Windows instead of another variant;
  • download USB drivers on your laptop from this place;
  • USB Debugging has to be enabled on the phone.

Step by step instructions

The new ZNUAND1 stock ROM is on its road to your Galaxy S Duos GT-S7562C. What needs to be done to get this firmware starts now.

  1. So, as far as the first step is concerned, your laptop needs certain files. Download them there. These files are Odin v3.09 (available on this page) and the Android 4.1.2 ZNUAND1 official firmware.
  2. Save both of them now, then have their content extracted on the laptop (with WinRar, 7Zip or WinZip). When Odin v3.09.exe comes along with several other files, you need to launch it on your notebook. When it’s there, your job is the following: restart the phone in Download Mode.
  3. The booting has to happen as described next: press and hold Home, Power and Volume Down together, then stop when a boot message is displayed and press Volume Up.
  4. Do this now: connect the two devices between themselves via the phone’s USB cable. Odin has to go search for the handset now. Wait until it finds it; at that moment, the Odin shall deliver a blue sign.
  5. This is what you need to know in order to continue the guide by adding the firmware file to the AP / PDA. Check Auto Reboot and F. Reset Time, then uncheck this box: Re-partition.
  6. For this step, you’ll be asked to do as follows: click on “Start“. You have to do this because the update firmware can now be installed on the handset. To make sure you know when the flashing is done, your device will have a “Pass” message in a green display and then the same device will automatically restart. The last step requires this from you: disconnect the Galaxy S Duos GT-S7562C from the other device.
  7. Your laptop and the phone are now no longer plugged to each other. Which is why you should now choose Settings on the handset, tap it, opt for About Phone, tap it too and discover the new Jelly Bean and the improvements we mentioned above.

In case the Android 4.1.2 and the goodies with which this version is equipped aren’t to your liking, your device is able to see its former ROM again. This has to be performed in a certain way, meaning this: open the NANDroid backup file and use it. After that, the old ROM will be restored. The update will, however, be revoked.

For questions, take a look under this guide. There you’ll find a comment box.

Posted In How To - By Cristescu Adrian

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