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You will have to download all three and install in correct order
cd1 backend software,
cd2 system software,
cd3 IEEE1394 software,
The instructions tell you to initialize the player first then insert cd1, after update the drawer will open remove cd1 insert cd2 power off via small power button (not via standby) power on drawer will close, the same will happen for cd3,when cd3 has finished drawer opens take disc out power off small button then on,the drawer will close you now need to initialize the player again,as the instructions are in french the only thing that has changed from when i was doing my 3910 is initializing at the start,But if you are still unsure i would check with your local denon office,Note while the player is updating do not touch any control as the drawer will open after every update,
Bit of background for you the upgrade for the denon link 3 was,
CD1 VER.6609-B. CD2 VER,6767-5. CD3 VER,ER1028.
For this upgrade you did not have to initialize,according to the denon service information sheet I have, As you can see the ver, type forCD2/3 has not changed but that's not to say the data on the latest download has not,Also the instructions for initializing has moved to after download to befor/after, so if in doubt just do everything, If cd2/3 data is the same the dvd player will overwrite, hope this helps and if anyone knows different please correct this, Brian.