This was originally posted by Jimona on the old board. I've just ported it over and edited bits where needed. All credit goes to Jimona.

Because of the many guessing of the NDS card in the Dreambox slot with Gbox 2.1x I did a test this evening.
My full card ID = 340071621 ( example )
My full box ID = 0205437287 ( example )
If you take notice at the readme file in the Gbox Center plugin it says that you must enter the both full numbers, if you do that with the above ID's it will create a NDS file in /var/keys with the content :



N: 0206E87A 0052F767
This is wrong !! if you reset the box you will notice that not one of the movie channels are open to watch this is because Gbox Center is calculating the wrong box serial.
If you go to this site You are not allowed to view links. Register or Login ( earlier mention by Anakin ) “you could also take the Windows calculator but the site works faster then looking for that rule(5 calculatorâ€? then enter all the digits of the card ID except the last one, so in this case :
Full card id = 340071621 forget the last digit so enter 34007162
and convert that one to Hex, than you will get
206E87A
Now notice the 7 digits this must be 8 so please a zero before all in this case :
0206E87A
Now take the box ID and forget the first digit, in this case :
Full box ID = 0205437287 forget the first digit so enter 205437287
and also convert that one to Hex to and you will get :
C3EB967
Notice also the 7 digits so place again a zero first :
0C3EB967

Now you have the correct key and the following line can be placed in /var/keys/nds

N: 0206E87A 0C3EB967

And after a reset of the box you can find this in /tmp/sc01 ( or 02 )


===== NDS ECM on CaID 0x0961, pid 0x0502 ======
CW0: 22 26 88 9C 91 35 02 20
CW1: 00 00 00 00 00 00 00 00
decode:slot-1
Edited/added by Asure:

EMM handling:

My advice: In /var/keys/gbox_cfg you use A { 02 } as default, and switch to A { 01 } once a month so to ensure updates. EMM will slow down the card a lot, if you got many peers.

Overlocking:

Gbox has the option to overclock a card. This does not damage your card!
It simply allows the reader to read the card at a higher speed.
The only problem is, some of the UK cards cannot be read at the highest speed.

in /var/keys/gbox_cfg:
F: { 58 } 03 # clock NDS cards @ 5.25mhz
F: { 58 } 02 # clock NDS cards @ 6.30mhz

I suggest to try with 6.30 mhz first, and check if it's working ok. If it's unstable, you can switch to 5.25mhz if needed.