Hi Madbat,
Thank you very much for the reply. I think my drivers are all right. I am using Windows 10 x64 pro and when i run cmd (as an administrator) and hit "fasboot devices" I have got response (device ID). I can reboot bootloader from cmd (fasboot) or from Nexus Rootkit tools. Based on that I assume that my drivers (I have pulled the drivers from here:
http://developer.android.com/sdk/win-usb.html ). My windows manager recognizes device as "android device > Android Bootloader Interface" (driver version 11.0.0.0) date 28/08/2014 provider google, Inc .
Back to ADB, I don't have opportunity to turn off debugging because OS is not starting. ADB cannot see the device from CMD. Therefore I am just using fastboot. Oh...and of course "recovery" is also not starting - when i go there I am getting "google login screen". I have tried to upload the TWRP or different bootloader with Nexusus root kit (application is establishing connection with N7, check drives, fastboot connectivity... pushes the image fine, reboots bootlader... and it still comes back at locked and the same version 04.05). I don't know the history of this N7, i have received as it is (locked and signed bootloader fl0 04.05) and I am really keen to fix.
I have read yesterday that some users has fixed that by taking the back cover and pressing the connection tapes... Seemed like a long shot. I have given it a go and .... nothing.
From my perspective the key would be to find out how to unlock bootloader.