Database Info

Bought a refurbished phone, get rid of apps (Vendor) auto-installing on first boot?

General Phone information:
Device: SM-G920F - Knox Tripped, phone was bought refurbished with 5.1.1 installed.
aTerminator™_G920F_DPAD_M.6.0.1_1.5500.Dev.EDGE_XE U - Android 6.0.1
3.10.61 SpaceX MM RC 2.1 - Link
Rooted with SuperSU 2.67
Flashed phone after cleaning up all data on it first (Clean install)
Problem:
Whenever I flash a new ROM from scratch, or recover the stock rom on the device, there are approx 5 applications that reinstall themselves on the very first boot of each ROM. Those applications are vendor-specific (Telenor, Norway). Are there any hidden partitions that makes this happen?
Why does this happen (a little explanation, so I understand how it works )? And how could I remove/prevent this from happening?
When I bought the phone, it was not locked to any service provider, but presumably it was before. The phone was informed to be a demo model at a store for about 2 weeks.
I haven't got to try any methods yet, as I am unsure about how and what this is.
Thanks for any responses, if you need any information besides what I entered above, just comment and I'll reply.

[Help!] Major update and partition issues for my Samsung Galaxy S7 (SM-G930U)

Hi everyone, there is this really strange issue with my phone, if i try to update it to the latest Nougat version it will update but will reboot and work for about 30 seconds before it restarts, the phone works well if i stay on the android version I have now (7.0 May 2017 update) but if I update it even just by one version it will continue to have this issue which forced me to restore it back via Odin. Also when I go into my settings and have a look at my storage I notice that it only says that it has 16GB storage capacity which isn't true. I was wondering if anyone out there has had this issue before or knows how to fix any of mine any information would be greatly appreciated. Before anyone asks, no my phone has never been rooted, I have tried factory resetting, I have tried other firmware's from different carriers, I have tried most things but nothing seems to work, please help. Thanks.

So it's updating via OTA and having problems or you're manually flashing to newer versions? And when you flash you're using all 4 firmware files and no just AP?

Confused while trying to update my phone

Hello everyone,
I have bought a used Samsung Galaxy S8+ from China. I have been using it for a few days and i havent noticed anything odd. I don't know the phones origin or for how long has it been used before I got it.
It is running on Android 7.0 (Nougat). Since this is an older version of android I've been thinking to update it to Android 8.0 (Oreo). But I know that the phone doesn't have the originl ROM installed on it since I am not able to update it from the settings app and I also noticed that Knox was tripped in Odin mode.
This is the part which confuses me: if i enter Odin download mode there is a section which tells you your model number, and for me it says SM-G955N but if I look at the back of the phone or in the settings app it says SM-G955FD.
I was planning to download custom ROM and just simply install it via Odin app on my pc.
I'm just worried that I don't mess up something on my phone since the model numbers don't match up. How do I install any software update from this point and does the missmatching model number influence it?
I would very much appreciate anyones help, thanks.

[Help] Phone Working On WRONG FIRMWARE.....!!!!!! {Magic Happened}

Hello Everyone!
So today something really interesting happened with me...... I'm feeling okay but i'm kinda nervous too.
I had rooted my phone earlier and flashed Lineage OS but i was encountering lots of problems so i tried to flash phone's firmware with odin.
My phone was Samsung Galaxy On7 Pro. I installed a firmware file and flashed it. But unfortunately, the firmware was of Samsung Galaxy On7 not Samsung Galaxy On7 Pro. When, i installed it, i encountered a DRK error! Then, it took me to Stock Recovery. From there, i wiped cache and internal storage and rebooted. It somehow worked very correctly. But now whenever i reboot my phone, i get Galaxy On7 logo not Galaxy On7 Pro. I don't know what happened but it's a MIRACLE of Android.........!!!!!!!
So, my queries are as follows:
Now, i'm stuck on Android Lollipop (5.1.1). There is a OTA update available within the system because it says its official now. What if i update? Will it even update? Or it will brick because phone model is different and firmware is diffrent?
Will it run smoothly in the situation where it is? (Note: I have not encountered any issues till now. Both Software and Hardware work well)
So, Miracles can happen in android world as happened with me.

Glad to hear you were able to unbrick your phone!
First a warning, I have no experience with your particular phone. But, I would think your update would go through. Usually the Pro and non-pro models are very similar and that is why your firmware worked. There might be some weird functionality in some areas like the camera or modems.
So, you can try the update. Worse case, you flash the On7 Pro firmware instead of the non-pro version again.

Well, the software updated and worked. No issues at all.
But i'm still confused how did it even work........
Anyway, i'm back to Marshmallow (6.0.1) again.
Everything works fine. I tested most things and all work correctly. I think Samsung just gave 8GB storage in non-pro version and 16GB in pro version and software is same xD
I also got new bootanimation and phone turn on sound from that
Moreover, i ordered a new Samsung M31 as i wanted more storage
But problems on older phone are also solved
Now, i will keep 2 phones

Question [TB-J606L] Downgrade from Android 11

Hello. Yesterday i installed latest OTA Android version (TB-J606L_S320030_210923_ROW) and noticed that it is really slow and it has even more bloatware that i don't want. I don't need to root it (because of bloatware removal) as i also need to revert it to default state as it was before update.
1. It is possible to find which version i had before this upgrade?
2. How could i downgrade system to previous version (i think it was Android 10 but i'm not sure)
PS: I successfully downgraded/rooted some devices but as every brand has it's specific way to perform downgrade, i'm asking here. Any advice would help and i'm aware of dangers of downgrading/rooting devices (bricking). In any case, it would be awesome to also link unbricking guide for TB-J606L, just in case It's always better to have plan B.
Update: I found source of roms for my device but i can't recognize which versions are old Android 10 and which are the new Android 11.