Cisco IOS-Memory

hi
i have upgrade the ios to 12.4 for cisco 3640 and i don't payed attention there is the memory 64mb is not enough to upgrade to this version ,the new ios loading complete on the flash 32Mb but when reload  the router it become on rommon mode, the tftpdnld command is not found
i have the old version c3640-jk9o3s-mz.122-46a.bin. how can i restore the old version?what can i do?
System Bootstrap, Version 11.1(20)AA2, EARLY DEPLOYMENT RELEASE SOFTWARE (fc1)
Copyright (c) 1999 by cisco Systems, Inc.
C3600 processor with 65536 Kbytes of main memory
Main memory is configured to 64 bit mode with parity disabled
rommon 3 > dir flash:
         File size           Checksum   File name
 28911360 bytes (0x1b92700)   0xb4f7    c3640-jk903s-mz.124-7.bin
leo11Asked:
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JFrederick29Commented:
Use Hyperterminal and the following procedure to transfer the old IOS to the router via xmodem.

http://www.cisco.com/en/US/products/hw/routers/ps259/products_tech_note09186a008015bfac.shtml#proc_3600
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leo11Author Commented:

Thanks for your input , i am waiting to receive the 128Mb memory
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