all downloads .... free
to download dct4 flash file
download you need the AL-plugin
How to download the flashfiles here

Datapackage

Modell Version Asic Type Datapackage  6800 (NHL-6) 5.46 2 Download    6800a (NSB-9) 5.58 2 Download

Service Manual

Modell Level Asic Type ServiceManual  6800 3 + 4 2 Download

Disassembly Video

Modell What Asic Type Video  6800 Assembly 2 Download    6800 Disassembly 2 Download