Upgrading Nokia Lumia 1020 to Windows 10 & Project Astoria questions

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Hi guys,

Here is the progress so far: I upgraded the phone yesterday from Windows 8.1 to Windows 10 using ToUrNiQuEt's iutool (tool works like a charm, it's so simple to use, truly amazing :-)) first to 10586.107 (13080.107) and then to 10586.1176 (14003.1176) as recommended by ToUrNiQuEt. Then I did a hard reset as suggested.

Now, here are the problems:
1. I cannot install Lumia Camera from Windows Store on Windows 10 Mobile 10586.1176 (it says the app has been blocked for this device, there is no possibility to download and install it from the Windows Store, download button is greyed out).
2. I tried unlocking bootloader using WPInternals tool (to be able to enable Developer settings and try to sideload Lumia Camera app) but it fails to enter Flash mode :-(
3. What I also didn't know is that HERE Drive+ app (which my father uses for navigation) is no longer working under Windows 10, it says the app is no longer supported :-( I don't know why but I cannot enable voice support in Windows Maps :-( I would at least want to have HERE Drive+ and Lumia Camera apps back
4. I tried rolling back to WP8.1 using Windows Device Recovery Tool but rollback fails :-(


Any ideas how to unlock Lumia 1020 at this stage in order to enable Developer settings to at least try to somehow install Lumia Camera? (installed Windows Camera app is crap, there is no selectable option to choose between high resolution photos and 5 MP photos, only possibility is taking 34 MP photos).

Or how to rollback to WP8.1? Or how to downgrade to 10586.107 to test if unlocking bootloader works from that build using WPInternals?

Thank you in advance!