Thank you,buddy.But ther's still another question:since i have only 4MB flash on my cisco 2503,and although you compress that IOS12.0 image,it's still much larger than 4MB,so,wher should i put the compressed file/image?on a TFTP server? any advance will be appreciated,thank you. henry 2001-05-08 20:06 f6d;6d::o f io< d< gh4o< d8;i"o< Re: B4C0B8B4: IOS upgrade, failure [7:3513] [7: 3520] It's very easy. You can use Unix tools gzip to compress the IOS file . Then change IOS file from *.bin to *.Z Final you should have 4MB plus IOS file size(uncompress) RAM Then you can play IOS 12.03 with 4MB flash and 18MB(16+2)RAM Good Luck "[EMAIL PROTECTED]" wrote: You can't do that upgrade,I have also a 2503 with 4MB flash, i want IOS 12.0??!! "John Brandis" 7"<~HK#: [EMAIL PROTECTED] 2001-05-08 09:04 Gk4p84 8x "John Brandis" JU<~HK#: [EMAIL PROTECTED] 3-KM#: 4+UfVB#: VwLb#: IOS upgrade, failure [7:3513] Hey all, I am back on for the day, Have a 2503 router with suspected 4MB flash. I need to upgrade from IOS 10.2 to at least 11.3. Problem is that IOS 11.3 is 5MB..... What can I do besides upgrade the flash.?????? John Brandis Network Engineer GoWireless Communications 155 George Street Sydney +61 2 9251 5000 FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED] FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED] Message Posted at: http://www.groupstudy.com/form/read.php?f=7&i=3730&t=3730 -------------------------------------------------- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]