Upgrading Nokia Lumia 1020 to Windows 10 & Project Astoria questions

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Well, sorry Bro, but some of your problems are a result of doing 5 things at the same time instead of doing one thing correct.
You asked for a way to bring the 1020 to Windows 10 mobile, we gave you a way.
Then the issue with the Lumia camera and the „by the way info“ you messed up the unlock with WPInternals and WDRT, we discussed that problem and you came up with the language pack at the same time we tried to help you with the other problem.

To be honest, I feel really sorry for advising Windows 10 mobile to you, but I cannot switch the time back. The iPhone / iPad can only be used with one single Account, Android uses different Accounts since Android 6 I guess, not that far away, but Windows 10 mobile is crapware because you can only use one single Account, sorry...

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First of all no need to feel sorry for anything from your side. You have all helped me A LOT so far, and thank you all for that!!
I'm learning by doing, even if that means making mistakes. I don't feel bad if I make any mistakes (yes, sometimes it can be frustrating), but it's how things work sometimes. The important thing is to never give up, and I hardly ever surrender when I start doing something and stumble upon a problem :-)

Here is the new progress update:

1. I managed to rollback Lumia to Windows 8.1 using WDRT.
While searching for solution I've stumbled upon a post (think it was on Microsoft support forum about an issue with not being able to restore to 8.1 using WDRT). The user found the fix by installing WDRT tool on his laptop with Windows 10 OS cause the tool didn't work on his other OS. And guess what, in my case that was the problem too :-)
So, for anyone having the same issue with WDRT, try installing it on a different OS (initially I have tried it on a laptop with Windows 7 Ultimate 64bit version and it failed to install 8.1 back on Lumia phone as the last step (the tool recognized the phone, downloaded software, rebooted the phone three times and gave an error that it failed to install software on the phone).

2. WDRT installed 8.10.12393.890 OS on Lumia, and then Lumia updated OS to the latest 8.1 build (8.10.14226.359). Both OS builds are supported with WPinternals.

3. Lumia Camera is now back (it's now called Nokia Camera, but it's the same app), and HERE Drive+ works with Croatian speech/voice navigation. Both apps work as before the upgrade to Windows 10.

4. I tried unlocking bootloader with WPinternals 2.8 installed on a laptop running Windows 7 Ultimate 64bit but it failed to enter flash mode even on this supported build (8.10.14226.359). Then I installed WPinternals 2.8 on a laptop running Windows 10 and it successfully unlocked bootloader.

5. Currrently I'm creating a backup of the current state of Lumia phone with WPinternals (I didn't setup any Microsoft or Google account yet so that I have a clean image saved).

6. After the backup completes (at the time of writing it says 1 hour 30 minutes more), I'll switch back from mass storage mode to normal mode.

7. If I'll still be eager to play this night with Lumia after backup completes I'll test other apps and / or try to sideload apps that are missing because Windows Store is no longer working on 8.1 OS as of 16th December 2019 (I made a list of all apps my father had on the phone before I screwed it up).

8. Call me crazy, but I'd like to perhaps test some other Windows 10 builds in the next days cause now I will have a backup to which I can fallback to in case anything goes wrong.

Thank you all, I'll keep you posted.