SmartAX MT841

1)

I am using a SmartAX MT841 ADSL router to connect to internet.
then i happened to read the following article:-
http://www.indiabroadband.net/bsnl-broadband/2669-problem-modem-router-mt841.html

on the above link the procedure for taking firmware backup is given as

on windows XP , you may try to take a backup of
current firmware by using the following command :
tftp -i 192.168.1.1 GET c:\MT841teimage.bin

now my question is what is the equivalent in ubuntu dapper ???

I installed tftp via synaptic and tried the following:-

tftp -i 192.168.1.1 GET ~/Desktop/ MT841teimage.bin

then i got the message as usage: tftp host-name [port]
so what will be the command/procedure to make a back up of MT841
firmware???

2)The firmware for MT841, which i have is V100R001C01B021SP01 dated
July 19 2005.
I believe there is latest firmware for this model of modem.
Where can i get the latest firmware ???
what are the steps for upgrading the firmware???
In case my modem stops working after upgrade what should i do to undo
the upgrade??
What are the precautionary measures ??
__________________

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