Router in boot mode - how to recover?

[khaiyin]

My router crashed and when I rebooted it, it is in boot mode (indicated by the prompt). How do I revert it back to the normal mode?

Router type: 2500

IOS version: 10.2(8a)

Memory: 1Mb

Config register set on 0x2102

Many thanks for any help/advice given. :)

[srittenberg]

you need to install IOS on it. using Xmodem to install the IOS, or if you have a flash card that has IOS on it, you may use it to boot up, and then tftp the IOS.