some flash have a small sliding mechanism on one of the sides to enable/disable write protection. check for this.
also, you may have to reFormat your flash. (of course can only be done if WRITE enabled)
the fact that i see 'eeeeeee....' output from your erase command tells me that it at least began erasing. (should not get the 'e' if the device is write protected; should get '........' if it is write protected.
I believe that the significant detail here is that the router is a 2500 router. The 2500 is a run from flash router and in normal operation the flash is indeed read only. One of the ways to get around this is to use Flash Load Helper (notice the messages that come from FLH) which is a utility that Cisco developed which does some things in the background to get around the read-only condition.
I wonder if the flash does have a problem. Though if it really was bad flash I would expect the erase to have a problem. My experience with 2500 routers is that sometimes when they have problems loading the image that you could open the case, reseat the flash, and the problem was resolved. It might be a good idea to reseat the flash and see if that helps.
To answer the question from Jayant about how to make the flash read/write it is necessary to boot the router into rxboot mode (config-register 0x2101) and when running the mini-IOS the flash will be read/write.
I am sorry that reseating the flash did not solve it. One possibility occurs to me is that the image file you are attempting to copy and load may be corrupt. In particular I wonder if in the process of moving the file it might have been done with TFTP not in binary mode. I have had the experience of tftping an image file, forgetting to specify that the transfer needed to be binary mode, and the result is a file that looks like an image file but produces the same kind of checksum error that you are getting. It might be worth loading the image file from Cisco again and being very careful about how the file movement is done.
If that does not fix it then I wonder if it would be a hardware issue in the flash.
Could be an issue like the detailed in the bug identified in report CSCdk81077, Cisco 2600 and 1720 Series Routers running the ROM monitor command tftpdnld, the command may report a bad checksum comparison when loading Cisco IOS software images of Release 12.0(2.2)T or later
This is actually a pretty cool feature, i didn't even know it existed until I was looking for a solution to advertise a subnet (prefix in BGP talk), only if a certain condition existed. This is exactly what conditional advertisements does
j ai une question j ai achete un routeur cisco 887VA-k9 , je le configuré avec la configuration ci- dessous
si je le lier avec mon pc portable sur l un de ses ports directement ça marche toute est bien ( la connexion internet + m...
Attached policy provides CLI access to the Cisco 4G router over text messaging. Two files are in the attached .tar file:
2. PDF with instructions on how to load and use the .tcl file.