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New Member

Cisco Router 1921 bootup error

When i switch on my router,i am getting this error...what is an issue

System Bootstrap, Version 15.0(1r)M15, RELEASE SOFTWARE (fc1)

Technical Support: http://www.cisco.com/techsupport

Copyright (c) 2011 by cisco Systems, Inc.

Total memory size = 2560 MB - On-board = 512 MB, DIMM0 = 2048 MB

CISCO2921/K9 platform with 2621440 Kbytes of main memory

Main memory is configured to 72/72(On-board/DIMM0) bit mode with ECC enabled

Readonly ROMMON initialized

program load complete, entry point: 0x80803000, size: 0x1b340

open(): Open Error = -66

boot: cannot open "flash0:"

boot: cannot determine first executable file name ondevice "flash0:"

System Bootstrap, Version 15.0(1r)M15, RELEASE SOFTWARE (fc1)

Technical Support: http://www.cisco.com/techsupport

Copyright (c) 2011 by cisco Systems, Inc.

Total memory size = 2560 MB - On-board = 512 MB, DIMM0 = 2048 MB

CISCO2921/K9 platform with 2621440 Kbytes of main memory

Main memory is configured to 72/72(On-board/DIMM0) bit mode with ECC enabled

Readonly ROMMON initialized

Compact Flash1: Not present

System Bootstrap, Version 15.0(1r)M15, RELEASE SOFTWARE (fc1)

Technical Support: http://www.cisco.com/techsupport

Copyright (c) 2011 by cisco Systems, Inc.

Total memory size = 2560 MB - On-board = 512 MB, DIMM0 = 2048 MB

CISCO2921/K9 platform with 2621440 Kbytes of main memory

Main memory is configured to 72/72(On-board/DIMM0) bit mode with ECC enabled

Readonly ROMMON initialized

program load complete, entry point: 0x80803000, size: 0x1b340

open(): Open Error = -66

boot: cannot open "flash0:"

boot: cannot determine first executable file name ondevice "flash0:"

System Bootstrap, Version 15.0(1r)M15, RELEASE SOFTWARE (fc1)

Technical Support: http://www.cisco.com/techsupport

Copyright (c) 2011 by cisco Systems, Inc.

Total memory size = 2560 MB - On-board = 512 MB, DIMM0 = 2048 MB

CISCO2921/K9 platform with 2621440 Kbytes of main memory

Main memory is configured to 72/72(On-board/DIMM0) bit mode with ECC enabled

Readonly ROMMON initialized

rommon 1 > DEV

monitor: command "DEV" not found

rommon 2 > dev

Devices in device table:

        id  name

   flash0:  compact flash 0           

    flash:  compact flash 0           

   flash1:  compact flash 1           

bootflash:  boot flash                

usbflash0:  usbflash0                 

usbflash1:  usbflash1                 

    eprom:  eprom                     

rommon 3 > dir flash0:

program load complete, entry point: 0x80803000, size: 0x1b340

open(): Open Error = -66

dir: cannot open device "flash0:"

rommon 4 > dir flash:

program load complete, entry point: 0x80803000, size: 0x1b340

open(): Open Error = -66

dir: cannot open device "flash:"

rommon 5 > dir flash1:

dir: cannot open device "flash1:"

rommon 6 > dir flas                         dir eprom:

getdevnum warning: device "eprom" has size of zero

getdevnum warning: device "eprom" has size of zero

getdevnum warning: device "eprom" has size of zero

getdevnum warning: device "eprom" has size of zero

getdevnum warning: device "eprom" has size of zero

device does not contain a valid file system

dir: cannot open device "eprom:"

rommon 7 > dev

Devices in device table:

        id  name

   flash0:  compact flash 0           

    flash:  compact flash 0           

   flash1:  compact flash 1           

bootflash:  boot flash                

usbflash0:  usbflash0                 

usbflash1:  usbflash1                 

    eprom:  eprom                     

rommon 8 > boot flash

program load complete, entry point: 0x80803000, size: 0x1b340

open(): Open Error = -66

boot: cannot open "flash0:"

an alternate boot helper program is not specified

(monitor variable "BOOTLDR" is not set)

and unable to determine first file in bootflash

loadprog: error - on file open

boot: cannot load "flash"

rommon 9 > boot bootflash:

Invalid devbase

device does not contain a valid FS

boot: cannot open "bootflash:"

boot: cannot determine first executable file name ondevice "bootflash:"

rommon 10 > dir         boot flash                                 dor      ir flash0:

program load complete, entry point: 0x80803000, size: 0x1b340

open(): Open Error = -66

dir: cannot open device "flash0:"

rommon 11 > dir flash1:

dir: cannot open device "flash1:"

1 ACCEPTED SOLUTION

Accepted Solutions
New Member

Re: Cisco Router 1921 bootup error

yes it should work

it worked on my 1841 to 2811

unless your CF is corrupted, if it is corrupted you ll see the error during the format

17 REPLIES
Hall of Fame Super Gold

Cisco Router 1921 bootup error

boot: cannot open "flash0:"

Your CF is either corrupt or not there.

New Member

Cisco Router 1921 bootup error

CF is there in router,but i think it is empty.

Now can you guide me how to put IOS in Flash.

Specify all the methods .....

Cisco Employee

Cisco Router 1921 bootup error

Hi Wajid,

Leo is right, the "boot: cannot open "flash0:"" indicates the issue with CF. If it is installed, then CF is damaged or CF slot on the router is faulty. This have nothing to do with image, as system cannot even open a file system. Lack of image would be reported with corresponding message.

I recommend to

1. reseat CF.

2. test with another CF or test this CF in another router.

3. replace either CF or router depending on step 2 results.

Kind Regards,
Ivan Shirshin

**Please grade this post if you find it useful.

Kind Regards, Ivan Shirshin **Please grade this post if you find it useful.
New Member

Cisco Router 1921 bootup error

But i am facing this issue with two new router,how can this possible that both router is faulty.

i will test which you recommend and reply you.

Hall of Fame Super Gold

Cisco Router 1921 bootup error

CF is there in router,but i think it is empty.

Where EXACTLY is the CF?  Is it in the slot or not?

New Member

Cisco Router 1921 bootup error

It is in router slot 0.i inserted in slot 1 and try to start the router but the same error come.

again i have try one more thing,i have inserted 2800 series router CF in my roueter,after that i got below logs.


rommon 32 > dir flash1:


WARNING: Unsupported compact flash detected. Use of this card during normal

         operation can impact and severely degrade performance of the system.

         Please use supported compact flash cards only.

program load complete, entry point: 0x80803000, size: 0x1b340

Directory of flash1:


2      44474680  -rw-     c2800nm-spservicesk9-mz.124-15.T10.bin

10861    44419656  -rw-     c2800nm-spservicesk9-mz.124-15.T13b

21706    31637032  -rw-     c2800nm-spservicesk9-mz.124-6.T7.bin

rommon 33 >

rommon 33 >

rommon 33 >

rommon 33 >  [Adir flash0   1:


monitor: command " [Adir" not found

rommon 34 >

rommon 34 >

rommon 34 >

rommon 34 > dir flash1:


WARNING: Unsupported compact flash detected. Use of this card during normal

         operation can impact and severely degrade performance of the system.

         Please use supported compact flash cards only.

program load complete, entry point: 0x80803000, size: 0x1b340

Directory of flash1:


2      44474680  -rw-     c2800nm-spservicesk9-mz.124-15.T10.bin

10861    44419656  -rw-     c2800nm-spservicesk9-mz.124-15.T13b

21706    31637032  -rw-     c2800nm-spservicesk9-mz.124-6.T7.bin

rommon 35 > dir flash1:

dir: cannot open device "flash1:"

rommon 36 > dir flash1:

program load complete, entry point: 0x80803000, size: 0x1b340

open(): Open Error = -66

dir: cannot open device "flash1:"

rommon 37 >

rommon 37 >

rommon 37 >

rommon 37 >

rommon 37 >

rommon 37 >

rommon 37 >

rommon 37 >

rommon 37 >

rommon 37 > IP_ADDRESS=10.10.10.1

rommon 38 > IP_SUBNET_MASK=255.255.255.0

rommon 39 > DEFAULT_GATEWAY=10.10.10.2

rommon 40 > TFTP_SERVER=10.10.10.2

rommon 41 >

rommon 41 > TFTP_FILE=c2900-universalk9-mz.SPA.153-2.T.bin

rommon 42 > tftpdnld -r


          IP_ADDRESS: 10.10.10.1

      IP_SUBNET_MASK: 255.255.255.0

     DEFAULT_GATEWAY: 10.10.10.2

         TFTP_SERVER: 10.10.10.2

           TFTP_FILE: c2900-universalk9-mz.SPA.153-2.T.bin

        TFTP_MACADDR: 7c:ad:74:c4:6b:60

    TFTP_DESTINATION: flash0:

             GE_PORT: Ge0/0

     TFTP_MEDIA_TYPE: Copper

        TFTP_VERBOSE: Progress

    TFTP_RETRY_COUNT: 20

        TFTP_TIMEOUT: 7200

       TFTP_CHECKSUM: Yes

       GE_SPEED_MODE: Auto Detect


Interface GE 0 link down

TFTP: Operation terminated prematurely.

rommon 43 >

Hall of Fame Super Gold

Cisco Router 1921 bootup error

I know what's going on.

Your CF is, probably, not supported and/or NOT FORMATTED correctly.

New Member

Cisco Router 1921 bootup error

guys i thing i forgot to tell you that,my flash is empty.this can be the reason for router going into rommon mode...?

Hall of Fame Super Gold

Cisco Router 1921 bootup error

my flash is empty.this can be the reason for router going into rommon mode...?

Yes.  That's what I said in my first post. 

New Member

Cisco Router 1921 bootup error

my doubt is clear.....

Now the flash is blank,what thing i have to upload in flash rather then IOS to start the router.help me for this as i am doing firts time this.

Hall of Fame Super Gold

Re: Cisco Router 1921 bootup error

Where exactly is the CF? Is it in slot1:?

Sent from Cisco Technical Support Nintendo App

New Member

Re: Cisco Router 1921 bootup error

It is in slot0

Hall of Fame Super Gold

Cisco Router 1921 bootup error

Now the flash is blank

Ok, you are NOT making any sense. 

First, you are saying that flash is blank or empty. 

It is in slot0

Next, you are saying it's in Slot0:.

It is in router slot 0.i inserted in slot 1 and try to start the router but the same error come.

And then you say it's in Slot1: 

Make up your mind:  WHERE DO YOU WANT YOUR CF TO GO?

If you're CF is corrupt or bad, get a new one. 

New Member

Re: Cisco Router 1921 bootup error

can you insert the flash on a different running router and format it there first then tftp the image you desire for the 2921?

and boot the 2921 with the flash you just formatted.

New Member

Re: Cisco Router 1921 bootup error

After doing this will router start normally.?

New Member

Re: Cisco Router 1921 bootup error

yes it should work

it worked on my 1841 to 2811

unless your CF is corrupted, if it is corrupted you ll see the error during the format

New Member

Re: Cisco Router 1921 bootup error

Yes its work,

after uploading the image into flash via tftp,router bootup correctly...

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