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[Guide] [How To] Downgrade I9505 4.4.2 to 4.3.1

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cefkiller
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Default [Guide] [How To] Downgrade I9505 4.4.2 to 4.3.1

Hello guys,

This is my first tutorial on the XDA-developers forum, in order to improve myself and be more efficient, do not hesitate to comment, or ask questions, I will be more then happy to answer since I have spent so much time on this, using two different I9505, mine and my boss's. So without further ado, let's get started

Here is a full guide on how to downgrade your I9505 from 4.4.2 to 4.3. KNOX WILL TRIGGER, there are other tutorials that show how to downgrade 4.4.2 to 4.3 without triggering the knox, I will explain some of them, but they are not 100% successful.

Do it on your own risk, neither me nor XDA-developers will be responsible if you brick or damage your phone.
Nevertheless, if you follow those exact steps, you won't have any problem (you may actually have some, but we can solve them together).

Requirements:
Samsung galaxy S4 I9505
Rooted phone
CWM or any custom Recovery
CyanogenMod 10.2.1 [click here] (jellybean 4.3.1) or any other custom with its proper kernel
Google apps jellybean [here]
(May need) Modem FNC4 or any above FNB8 [here]
(May need) Pit File to resolve some problems [here]


[KNOX 0x1 (triggered) WORKS 100%]

[Step 1: Optional, only if you can root your phone]
Before we start, I advice you backup your phone, save your EFS folder which contains your IMEI and other "sensitive information" related to your phone:
To do that, first you need to root your phone, then use a file explorer such as "ES FILE EXPLORER".

Root enabled
  • Go to your explorer and turn on "root explorer".
  • Once you have done that, go to your root folder.
  • Copy the folder called EFS to your SD Card.
  • (Optional)Make another copy on your HDD or file-hosting provider.

[Step 2: Installing the rom]
  • Copy your CyanogenMod or any other 4.3 custom fw + Google apps into your sdcard
  • Shutdown your phone
  • Press and hold down volume up, home button and power button to start in recovery mode (for about 5secondes)
  • Wipe data/cache (if you have philztouch, chose that you will install a new rom) and press YES
  • Advanced -> Wipe dalvik cache YES
  • Install zip from sdcard -> chose cyanogenmod zip file -> YES
  • Install zip from sdcard -> chose gapps zip file -> YES
  • Reboot your computer.

[Step 3: Resolving some problems]

If the phone application crashes whenever you try to make a phone-call, then you should flash your modem.
  • 1.Shutdown you phone.
  • 2.Press and hold down volume down, home button and power button to start in download mode until you see the confirmation, then press up to continue
  • 3.Plug your micro usb cable into your phone, go to odin
  • 4.Select modem (or CP for odin 3.09) and select the modem file
  • 5.Uncheck Autoreboot
  • 6.Click Start
  • 7.Once done, unplug your cable, take off the battery, put it back, redo steps 2 to 4
  • 8.Check this time Autoreboot and Start the process

If you flash your phone and you don't have the sound, then I advice you go back to 4.4.2, and follow this guide from the beginning

[KNOX 0x0 (not triggered) WIFI OFF]

I do see the point to go back to 4.3 (a lot of applications don't work properly on Kitkat + better performances for the S4 on Jellybean), however, I don't know if someone can use his phone without the wifi. Anyway, if you want you can try this method, for simply go back to 4.3, use saferoot and install mobile odin to go to 4.4.2 rooted, without triggering the knox (be aware that there is a simple method which roots the 4.4.2 but this doesn't work on newer 4.4.2).
I remind you that KNOX triggers only if you use a custom rom or modified kernel, in that case Knox turns to 0x1, and this cannot be undone.

Instead of writing my method, I find out two threads on xda.
  • First one, you cannot make phonecalls unless you flash the modem, and then you won't have the wifi anymore.[here]
  • Second, not tested yet, but it is promising, you can find out [here]

That's it guys, hope this will help you find your happiness.




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tariq2kn
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I get 'No SIM' after 4.4.2 update. Any solution dear?
 
cefkiller
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Default Sim adapter?

Quote:
Originally Posted by tariq2kn View Post
I get 'No SIM' after 4.4.2 update. Any solution dear?
Ohhh noo sim, did you have a nano sim with an adapter or something ? I get this with my nanosim with the adapter
 
tariq2kn
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(Last edited by tariq2kn; 25th August 2014 at 02:53 AM.)
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Quote:
Originally Posted by cefkiller View Post
Ohhh noo sim, did you have a nano sim with an adapter or something ? I get this with my nanosim with the adapter
No adapter used.
My phone seems to be region locked, btu. I had an unlocking pin code to use another sim. But, when I am using the phone in India, It doesn't asks the pin but I get No SIM, I can see the signals on the statusbar & in about/status. It is not able to resolve the network. The /system/csc/customer.xml file states the mmc 404 as network blocked. The changing of network bands is also not possible. It is set by default at lte/wcdma/gsm.
I tried downgrading to 4.3 but got the phone in emergency mode, probably due to the locked bootloader. The Service Mode by *#0011# doesn't moves after the initial page.
How do I get through this mess? Kindly help in solving the issue.
 
cefkiller
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(Last edited by cefkiller; 25th August 2014 at 08:46 AM.) Reason: forgot the link
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Quote:
Originally Posted by tariq2kn View Post
No adapter used.
My phone seems to be region locked, btu. I had an unlocking pin code to use another sim. But, when I am using the phone in India, It doesn't asks the pin but I get No SIM, I can see the signals on the statusbar & in about/status. It is not able to resolve the network. The /system/csc/customer.xml file states the mmc 404 as network blocked. The changing of network bands is also not possible. It is set by default at lte/wcdma/gsm.
I tried downgrading to 4.3 but got the phone in emergency mode, probably due to the locked bootloader. The Service Mode by *#0011# doesn't moves after the initial page.
How do I get through this mess? Kindly help in solving the issue.
Mmm I am afraid your phone is region locked, in this case it is very difficult to resolve the issue, for example if you are in Turkey your phone must be registered through a service, or purchased locally, I don't know maybe in India it is the same, meanwhile, try using your original sim Card, if it works, try using another sim card, i have a sim card that works on my Oneplus One but doesn't on the S4, it is crazy but what can we do. Finally, (before selling or throwing out your phone) try to visit this thread it might be helpful to follow those steps, visit all the links there, each one propose a solution. Hope you will find your happiness.

Regards.
Moncef
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