I assure you that we want to do everything in our power to help you @Other. However this particular issue you're experiencing is the kind of thing we would usually refer you to the manufacturer for. We just want to make sure you get the most complete answer possible and they're the ones who provide the OS updates. The PM serves as a way for us to gather more information from you so we can see if there are any alternative solutions we can work out for you here. We want to make sure our customers stay happy! 
You can find the Private Messages we've sent you by clicking at the top right where you see your username, you'll notice a new section appear with an icon that looks like a little envelope. This is your inbox where you can check out your messages.
@Other wrote:
hmmm, Samsung and Lg are two differant companies and both platforms use Marshmallow. (along with others)
It is an Android / Marshmellow and since Android and Google are partners in globalism, lil guy gets lost.
If it was a manufacter thing then why was the phone sent out where I could do what I did with no Marshmallow.
Did my phone come with "lollipop" then upgraded to this unwanted marshmallow later?
I can't tell on this side of the screen if it was lollipop or not, can you tell me if it was?
I did not ask for this marshmallow nor do I want it now how can I dump this gooey mess and get back the ay it was?
All I do know no is that it can be done because I was able to do it, I just do not speak or read tech and I am reaching out for help.
Hello again,
The Android OS and Apple iOS are the main operating systems for cellular phones and tablets. As such, if the phone manufacturer is not Apple, then they will likely be using the android operating system. So yes, many phones use the android platform. The first thing you should note is that KitKat, Lollipop, Marshmallow, Nougat, etc are all subsequent versions of the android platform. KitKat (version 4); Lollipop (version 5); Marshmallow (version 6); Nougat (version 7). There are earlier versions as well, however, they're not relevant to this discussion. Each version builds on the previous versions -- adding or changing functions, security measures, etc
Phone manufacturers will usually make a phone with the most current operating system at that time. However, the actual hardware of the phone will probably outlast that version of the operating system. Customers generally prefer to have the most up-to-date operating systems on their phones. That said, most customers are not able to buy new phones every couple of months. That's why the manufacturers provide updates to later OS versions.
With regards to your phone, the LG G3 D852 was originally shipped with KitKat 4.4. Marshmallow offers you additional functionality and security. Unfortunately XP does not seem to support Marshmallow. As another community member noted, Windows stopped providing support for XP.
I mentioned in a previous post that there was a way to get your phone back to the way it was when you bought it. I also mentioned that I did not think it was something you could do yourself. Changing the phone's operating system is involved and requires the use of a computer. You, yourself note that you do not speak or read tech.
Are there any phone repair shops in your vicinity you could take your phone? Most of them should be able to flash the original firmware. Fido or LG might be able to send it away for 'repairs'.
I understand you're reaching out for help and I am sorry if I seem reluctant to provide the actual details of how to revert the operating system back to what it was.
Hope some of this helps
Cheers
Hey @Other
The LG G3 was originally sold with the Operating System: Android 4.4.2 (Android KitKat)
As much as we would like to give you a hand with this, reverting to an older software version is not something that we support. So we couldn't provide you a step by step on how to go about this, as we don't have that information.
@Other wrote:
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reverting to an older software version is not something that we support, Please clarify "support"
The phone use to work just fine,
...
Hello again,
Reverting a phone to an older version of the software is not as simple as un-installing the update. The software is hard-coded in the phone's read-only memory (firmware). Changing the phone's software involves flashing a different firmware to the phone. The process isn't officially supported because if not done properly, it can permanently damage the phone, rendering it useless. Rather than working just fine, it might not work at all.
@Other wrote:
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It was Fido that allowed a third party to break in and change how my phone operates without my permission?
...
By third party are you referring to Google? Android is the operating system developed by Google. It's their software (albeit with tweaks from LG and/or Fido). It's a similar situation to purchasing a HP computer running Windows from Best Buy. One cannot hold Best Buy (or HP) responsible for Windows updating its software.
Your contract with Fido is for phone services (calls, text, and/or data). Fido may also have provided you with the phone, however, they are not culpable for how the phone is configured. By default, the phones are set to automatically update the software. It would have been up to the customer to disable the automatic updates. Without disabling the updates, your permission to update the software would have been inherent.
I'll reiterate: If you do revert your phone back to an earlier version of android, you would need to disable the automatic updates or else you'll just end up back where you don't want to be.
Hope this clarifies
Cheers
@Other wrote:
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So can you please send a step by step list on this proceedure?
Hello again,
I'm sorry, but since the procedure is not supported by Fido, it would be inappropriate to post the steps here. More importantly, there is a real risk that the phone could be rendered inoperable if not done properly. It shouldn't be attempted by the inexperienced. Again, are there any phone repair shops in your vicinity? A Fido kiosk is not a repair shop -- they would need to send in for 'repairs'.
If you are insistent on trying to revert your phone on your own, you would need to familiarise yourself with flashing firmware. There are many other venues which provide the steps. You can search for the method and required programs and firmware yourself. They're not difficult to find. If you are unable to find them, perhaps it's not the best idea to try to do yourself...
Sorry for not providing the step by step, but hope some of this helps
Cheers
Hey @Other
Thanks for filling us in!
I get that you've checked out their webpage.
Did you also speak (over the phone, or by chat) with the Technical Support of the phone manufacturer itself, to know if they can help with this? (LG)
