3620 boot from tftp

I have 3620 cisco router and would like to boot IOS from tftp server
because another IOS is to big for 8MB flash memory.

System Bootstrap, Version 11.1(20)AA2
IOS (tm) 3600 Software (C3620-I-M), Version 12.3(16a)

I was try with command

boot-start-marker
boot bootstrap flash flash:c3620-i-mz.123-16a.bin
boot system tftp c3620-ik9o3s-mz.122-37.bin 10.0.0.195
boot-end-marker

and configuration r ..
Telecom, Cabling and VoIP continues...
Tags: Networking Broadband cat5 cat6 Ethernet