I boys, for repair siemens with display blue for 2 second and buzzz follow this metod:
1 You need a usb cable not original, freia, vklay, winsup and fullflash. Find program and fullflash here
2 Make testpoint (be careful)
3 Flash the phone with vklay (in advanced option enable bootcore writing)
4 Unlock with freia, use direct unlock no map is saved and use original imei
At this point the phone is ok, use winsup for upgrade firmware and put correct language pack.
I revive 3 C60 and 1 A60 with this metod.
Excuseme for my english.