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Where can I download Marshmallow 6.0.1 firmware for Koodo mobile


I got my Samsung S6 phone last end of June (2016) and it has been working fine. But after upgrading to higher version (Android N), the phone becomes unstable and slaggish, quite often, it's restart itself. I want to go back to earlier version when I bought the phone. But doing some research over internet, I couldn't find a place to download the firmware for Marshmallow 6.0.1 KDO.

Also, lots of posts mentions enable OEM unlocking, but I couldn't find that option at all in "Developer options" at all. Is this because Koodo doesn't give permission?

Thanks,
Shawn

12 replies

Userlevel 7
Badge +4
You could use Telus firmware. That should be more available.

Sorry do you just mean carrier unlocking?
Goran wrote:

You could use Telus firmware. That should be more available.

Sorry do you just mean carrier unlo...

Not sure if I got it. My provider is Koodo Mobile, not Telus.

Unlocking will get me to see "OEM unlocking" option in "Developer options"?
Userlevel 7
Badge +4
I don't think you could downgrade your OS in Android from carriers. Manufacturer themselves don't support downgrading.

You would have to do it on your own and you have to root your devices (void warranty). There are instructions everywhere.

Regarding your Android N phone, I would suggest you reset to factory setting, that might help.
Dinh wrote:

I don't think you could downgrade your OS in Android from carriers. Manufacturer themselves don't...

Thanks for replying, before doing a factory reset, I need to copy all data first?
Userlevel 7
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Dinh wrote:

I don't think you could downgrade your OS in Android from carriers. Manufacturer themselves don't...

Yes, of course, backup using samsung tools and google. The factory reset will delete everything.
Userlevel 7
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Dinh wrote:

I don't think you could downgrade your OS in Android from carriers. Manufacturer themselves don't...

Yes you want to back up everything first.
Dinh wrote:

I don't think you could downgrade your OS in Android from carriers. Manufacturer themselves don't...

I downloaded in Play store "Easy back up & restore", but it seems that it doesn't back up data, but just the apps.
Userlevel 7
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Dinh wrote:

I don't think you could downgrade your OS in Android from carriers. Manufacturer themselves don't...

If you are flashing firmware, a NANDroid backup is a must via twrp
Userlevel 7
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Dinh wrote:

I don't think you could downgrade your OS in Android from carriers. Manufacturer themselves don't...

I would only trust backup program from either samsung or google. Other apps cannot warrant anything.

You could use google photos and contacts to backup your photos and contacts. those are most important stuff. I would use usb cable to backup other stuff. Many apps like viber has backup function. Games also can be backup with google play, just make sure you connect to it and test before you delete.
Userlevel 7
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OEM unlock is the 4th field in Developer Options for me.  Im using a S7Edge and downgraded from Nougat to Marshmellow.

And I sympathize with you.  Finding firmware is tough, download speeds are dreadful, and sometimes they dont work
Userlevel 5
sammobile.com might have the firmware you are looking for, as well the app Smart Switch from Samsung will back up pretty much everything.  There is a desktop/laptop app available from the Samsung website that you use with a computer after you plug the USB cable into the computer
Userlevel 3
Sammobile downloads are very slow. Updato has the same files and you can download firmware files at a faster speed.

http://updato.com/firmware-archive-select-model?q=GALAXY+S6&exact=1&r=KDO&v=&rpp=15

Download the latest file and flash it using ODIN, search the instructions on how to do it.

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