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How do I upgrade an 877's ADSL firmware?

Hello,

I'm trying to upgrade an 877 router.  The IOS is c870-advsecurityk9-mz.124-24.T2.bin and the ADSL firmware is 3.0.14:

I see 3.0.43 and 4.0.17 are available, which one should I download and then how do I upgrade it from my tftp server?

Here is some more info:

Cisco 877W (MPC8272) processor (revision 0x300) with 118784K/12288K bytes of memory.

MPC8272 CPU Rev: Part Number 0xC, Mask Number 0x10

4 FastEthernet interfaces

1 ATM interface

1 802.11 Radio

128K bytes of non-volatile configuration memory.

24576K bytes of processor board System flash (Intel Strataflash)

sh flash
24576K bytes of processor board System flash (Intel Strataflash)

Directory of flash:/

    2  -rwx    18808432  Dec 27 2009 09:10:46 +00:00  c870-advsecurityk9-mz.124-24.T2.bin
    3  -rwx      544520  Oct 30 2010 20:36:57 +00:00  crashinfo_20101030-203621
    4  -rwx      587652  Oct 30 2010 20:55:02 +00:00  crashinfo_20101030-205448

23482368 bytes total (3536896 bytes free)

Thanks

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