The boot loader is "BOOTLDR: C3750 Boot Loader (C3750-HBOOT-M) Version 12.2(25r)SEC, RELEASE SOFTWARE (fc4)".
By default, a configuration register setting that tells it to boot using the first IOS image stored in Flash memory. If a valid IOS image isn’t found in Flash, it will then attempt to “netboot” using an IOS image stored on a TFTP server. If even this fails, the default configuration register tells to boot using the image stored in ROM.
The following example shows a router configured to boot from an image in Flash, followed by an image stored on a TFTP server
Router(config)#boot system flash c3750-js-l.120-7.T Router(config)#boot system tftp c3750-js-l.120-7.T 192.168.1.100
After issuing the boot system commands, they can be viewed using show run.
Thanks for your reply. Those commands did not work. Firstly, the IOS (c3750-ipbase-mz.122-35.SE5.bin) would not retain two boot lines. Only the last one entered survived. Secondly, the syntax above did not work. Here is the help output:
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