bad image and register 0x2101 cause continuous reboot

[willinsau]

My router is Cisco 3640,yesterday I found a new image from web and updated it. Today when I reboot it ,it shows

image unzip failed ,after 4 times reboot ,it change to  Rommon 1> model.

I want to solve the issue,so view the internet,and a post 

told me change the freg to 0x2101,I did it ,and reboot.but now it reboot again and again, can not reenter recomm model

it repeats shows:

=========================================

======================================

 I try to use CTRL+BREAK when it boots in 20 sec

but it doesn't work

I think 0x2101 cause it try to boot from the image,but the image is corrupt,and 0x2101 do not lead to rommon

so it boots again and again , I can not break it

how can I do now?

[balaji.bandi]

what was the version was old what version you trying to upgrade.

When you get Rommon 1>  - then follow  ROMMON recovery :

https://www.cisco.com/c/en/us/support/docs/routers/3600-series-multiservice-platforms/15080-recovery-c3600.html

[willinsau]

sorry, the problem now is it could not  get Rommon 1>

It reboot again and again,I think I changed the register to 

0x2101 cause the 

Boots into bootstrap
Ignores break
Boots into ROM if initial boot fails
9600 console baud rate
=================

Now the issue is the router can not get Rommon 1>

how could I do ?

anyway to reset the register by hardware??

tkx

[Leo Laohoo]

---

@willinsau wrote:

 I try to use CTRL+BREAK when it boots in 20 sec

---

Why?  
The 3640 router stores it's files in the PCMCIA cards, right? 

What happens if the PCMCIA cards are removed and the router gets powered up?