Can anyone explain the different modem type codes used for the firmware update so far i've just used the same modem code when i've updated the firmware on my 2820N but what are the actual differences between the different codes.For instance i'm currently using the V3.3.5.2A211801 code which is the same code my router came with so are other codes just for different regions ?

Hello,

not to be acerbic but have you read the release notes. i.e.

NOTE: ADSL Modem Codes
For general purpose usage on UK lines, modem code 232201 is recommened
For ADSL2+ Annex M lines, the latest modem code, 2471201 is suggested
For line speeds of less than 4Mbps, on lower quality lines a modem code with more conservative paramaters, 211801 is suggested

This is in the zip file you download. and don't forget, "have you tried turning it off & on again"

hope that illuminates a bit.

TTFN