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I need find IOS appropriate router 1841

I need upgrade IOS on router 1841 , but new IOS 12.4T size Over memory (our Memory 32M), someone help me find IOS 

appropriate for upgrade

* I download version c1841-adventerprisek9-mz.124-25g.bin , but i not sure it use with our router

i have show version

Cisco IOS Software, 1841 Software (C1841-ADVENTERPRISEK9-M), Version 12.4(9)T7,
Technical Support:
Copyright (c) 1986-2008 by Cisco Systems, Inc.
Compiled Thu 10-Jan-08 15:41 by prod_rel_team

ROM: System Bootstrap, Version 12.4(13r)T, RELEASE SOFTWARE (fc1)

Thaitech-pattanee uptime is 4 days, 1 hour, 11 minutes
System returned to ROM by reload at 10:57:40 WAST Thu Oct 9 2014
System restarted at 10:59:00 WAST Thu Oct 9 2014
System image file is "flash:c1841-adventerprisek9-mz.124-9.T7.bin"

This product contains cryptographic features and is subject to United
States and local country laws governing import, export, transfer and
use. Delivery of Cisco cryptographic products does not imply
third-party authority to import, export, distribute or use encryption.
Importers, exporters, distributors and users are responsible for
compliance with U.S. and local country laws. By using this product you
agree to comply with applicable laws and regulations. If you are unable
to comply with U.S. and local laws, return this product immediately.

A summary of U.S. laws governing Cisco cryptographic products may be found at:

If you require further assistance please contact us by sending email to

Cisco 1841 (revision 7.0) with 354304K/38912K bytes of memory.
Processor board ID FHK123821SF
2 FastEthernet interfaces
1 ATM interface
1 Virtual Private Network (VPN) Module
DRAM configuration is 64 bits wide with parity disabled.
191K bytes of NVRAM.
31360K bytes of ATA CompactFlash (Read/Write)

Configuration register is 0x2102



Best regards



hi,what features do you need


what features do you need for your 1841?

you can buy either a 64 MB or 128 MB CF card which are cheap nowadays.

you could check the features on Cisco's software download site or you can browse at

Community Member

hii need features


i need features adventerprisek  same old IOS and i can't buy either memory , i need upgrade for solve internet ,

you  have IOS recommend  me ?






hi,the IOS adventerprisek9 12


the IOS adventerprisek9 12.4 and above requires 64 MB flash.

i saw this one available on cisco's download website and only requires 32 MB flash:



1841-adventerprisek9-mz.124-25g.bin is listed as requiring 64 MB of flash - however, the file is only 24.35 MB in size, so if the remaining space is enough for other requirements (crash files, archived configs, etc) then it should work...

Is there a feature that you

Is there a feature that you require in the Advanced Enterprise image that isn't present in the Advanced IP Services image? The Advanced IP Services 12.4.25g image only requires 32Mb of flash and should work well unless there's something specific that it can't do.

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