Below is the procedure for upgrading firmware.
1. Download the file and rename the file "adsl_alc_XXXXX.bin".
2. Copy the firmware file to the flash:
3. For the new firmware to take effect, reboot the device.
4. The "show dsl interface atm 0" output gives the details of the firmware file in use
Note:
- The firmware file should not be renamed when being copied to the flash , Since the router looks for the presence of file named "adsl_alc_20190.bin" to initiate the flash upgrade process .
- If IOS is now able to find a valid firmware in the flash then it would always use that rather than the firmware embedded in IOS .If users want to use the embedded firmware, they have to ensure that there is no valid firmware file in flash.
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