N1 stuck at bootloader

Received new N1 today with Taiwanese ROM and updated via OTA -> got some problems and reseted to factory default --> got Chinese version.

I tried to get back to Taiwanese version to get Google services working with this help:

Quote:

1.root your device:http://forum.xda-developers.com/noki...-root-t3125771 2.flash Taiwanese system.img http://forum.xda-developers.com/noki...t3083115/page4 #39

Installed all correct ABD drivers according to link above and device manager shows up correctly. At the settings I enabled USD Debugging and OEM unlock (or something like that) and rebooted to
Started Intel Fastboot Tethered Temporary Recovery and started T4 option -> failed with unable to write recovery.img (no permissions)

Now when I enter fastboot oem lock and try to start it says:
Recover > Press POWER key
Your device is unable to start because the boot image has failed to verify. You may attempt to recover the device.

I can not access recovery mode. I can not use adb. Actually now it went to mode where it only says above (recover press power key) message OR displays a battery icon with a question mark in it.

What to do now? Any ideas are welcome!