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While doing searching in hacki.at forum, I found post about unzip/uncompress cisco IOS.

Ouch, I didn’t know that

First option using winrar and the second is using unzip program from gnuwin32.

I try winrar and just fine, next step I try unzip program. Working well too.

Software for unzip can download here

After download I doubleclicking it then extract the files to C:\unzip using winzip.

Double click ‘bin’ folder

Copy IOS file to ‘bin’ folder

Open command line

Microsoft Windows XP [Version 5.1.2600] (C) Copyright 1985-2001 Microsoft Corp.

C:\Documents and Settings\Administrator>cd c:\unzip\bin

C:\unzip\bin>dir /p/w

Volume in drive C has no label.

Volume Serial Number is B050-C5AA Directory of C:\unzip\bin

[.] [..] c2801-spservicesk9-mz.123-11.T10.bin

funzip.exe SFXWiz32.exe

unzip.exe unzip32.dll

unzipsfx.exe uzexampl.exe

zipinfo.exe

8 File(s) 21.003.208 bytes 2 Dir(s) 9.487.257.600 bytes free

C:\unzip\bin>unzip c2801-spservicesk9-mz.123-11.T10.bin

Archive: c2801-spservicesk9-mz.123-11.T10.bin warning [c2801-spservicesk9-mz.123-11.T10.bin]: 23272 extra bytes at beginning or within zipfile (attempting to process anyway) inflating: C2801-SP.BIN

C:\unzip\bin>dir /p/w

Volume in drive C has no label.

Volume Serial Number is B050-C5AA

Directory of C:\unzip\bin

[.] [..]

C2801-SP.BIN c2801-spservicesk9-mz.123-11.T10.bin

funzip.exe

SFXWiz32.exe

unzip.exe

unzip32.dll

unzipsfx.exe

uzexampl.exe

zipinfo.exe

9 File(s) 75.765.244 bytes 2 Dir(s) 9.432.301.568 bytes free

C:\unzip\bin>

Wow, 54.479 kb trully compressed file