[Nokia 6.1 Plus (X6) Questions & Answers] vostok_amphibia:
I managed to solve the problem. If you don't have a lot of experience with Android, you'll have to do a bunch of research, but you should manage. Very roughly, I pretty much flashed a new operating system on the phone. I found the correct os rom from here: https://xdaforums.com/nokia-6/help/nokia-x6-nokia-6-1-plus-global-rom-t3822657. I'm definitely a novice in doing weird **** with androids so don't consider me an expert or anything, but I did get my phone to work.

If you don't know what to do here's a rough guide.

1. Get adb to work

Adb is basically a way for your computer to tell crude instructions to your phone and all kinds of random ****. The very very first thing you should do is unlock developer options and turn on developer options by going to settings->system->about phone and click on build number something like 7 times and then go back to system, where developer options have appeared and turn on OEM unlocking and usb debugging. You should be able to find some type of adb installer installer simply by googling how to install adb or something, I can't remember at all where i found mine from, but there are certainly a lot of guides online. It really doesn't matter that much if it's from a few years back, as long as adb works. Your phone should install all correct drivers from your phone simply by connecting it, but you may need to download qualcomm drivers online, I don't really know because I downloaded every random driver online until finally it worked. All I can say that to finally get it to work I connected my phone to my computer via cable with usb debugging enabled and clicked the windows message so that the phone agreed to the final necessary drivers and amazingly it worked. To make sure that everything you need is in working order type the following commands into adb:

First "adb devices" if it says something like device found, DRG...., everything's good so far

Then "adb reboot bootloader" and "fastboot devices", if it says the same thing again, adb is completely installed.

I found this to be by far the hardest part in the whole operation, because the Nokia X6 is such a new phone that there are no real guides or official drivers online. Don't be discouraged if it takes some time to get through this part!

2. Unlock your bootloader

Nokia is pretty cool and all, but that they are pretty restrictive with their phones so that you actually have to pay to a third party to be able to unlock your bootloader. You need to buy a bootloader unlock key from this place: https://www.techmesto.com/buy-nokia-bootloader-unlock-key/. I know it seems super shady, but it at least worked for me so there's that. I wouldn't really buy the unlock key before getting adb to work, though. After that, you'll probably be best off following this guide to unlock the bootloader: https://www.techmesto.com/guide-unlock-bootloader-nokia-android-phones/

3. Install the nokia online service tool and nb0 unpacker

The Nokia OST you can find here: https://www.theandroidsoul.com/download-nokia-online-service-tool-ost/, and I think the guide there is pretty self-explanatory, so just follow that. The nb0 unpacker you can find here: https://xdaforums.com/android/general/nb0-unpacker-packer-tool-t3699464. This one should be very simple to install.

4. Download the Nokia X6 operating system and unpack it so you can flash it with the online service tool.

The nokia X6 operating system can be found from the google drive link in this post: https://xdaforums.com/nokia-6/help/nokia-x6-nokia-6-1-plus-global-rom-t3822657, and be sure to pick the on mentioned in the post, the one labeled "DRG-229E-0-00CN-B01". After downloading it, you should be able to find a .nb0 file in the zip. Extract it somewhere nice and then use the nb0 unpacker you installed to unpack it. After this, open the mlf-file in the unpacked nb0 folder and follow the following instruction found on the download post i linked before:

"Modify *.mlf file, line 7 ~ 9;

INITOPTION = 0x20000

INITDLTYPE = 0x60

SECURITY_VER = 0x0001" [MENTION=4985967]Xkernels[/MENTION]

5. Flash the os on your phone

Make sure to delete everything from your phone before doing this, because every guide I've seen instructs to do this. This may not even be necessary as the OST setting you'll check later indicate that everything will be erased anyways, but idk what could happen so better safe than sorry. You can do this probably in many ways but one way i found is to go to recovery (type "adb reboot recovery" on your pc and then press the power and vol up button at the same time), and factory reset. Then go to the bootloader from there and type "fastboot erase system". A bunch of text should appear and you should be set to flash. Now with your phone connected to your pc, open the Nokia OST and "Select *.mlf files and tick "Normal Download", "Erase user data", "Erase error data", begin to flash." [MENTION=4985967]Xkernels[/MENTION].

6. Your phone should be ready to use, though it will probably need some configuring

The first things you'll probably want to do is use the browser to download a google play apk online after which you can use the play store and download all necessary apps from online. I couldn't find netflix from the appstore but I simply downloaded the apk online and it works too. I had problems with the stock keyboard so I installed Gboard, but all apps should be in working order and my phone works without a hitch now!

For the record if you manage to brick your phone during the process, don't hold me liable. If you followed this guide, you probably bought a chinese random phone and it didn't work like you wanted it to and wanted to fix the problems by installing an operating system from online, using a guide from a person you didn't know at all. All I can say is that what I did worked for me and I simply wanted to help strangers on the internet and this worked for me. So if, because of this guide, everything is ****ed with your phone and your computer is full of viruses, I will most likely be glad to help and you can blame me by yourself, but I definitely would appreciate if you would simply be civil and not tell me how I'm an awful person, because once again, I'm just a Finnish guy, who himself bought a Nokia for 200€ from eBay and had to spend hours upon hours of my own time trying various methods of getting my phone to work and learning how to use adb and how to flash roms on my phone. Honestly the experience was pretty fun for me, because I like to do random **** like this and learning new things, but I did have other things to do with my time like study physics and even now I wrote this, in my own biased opinion pretty good, guide using my own time, simply because knowing I did something good brings joy to my heart.