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Hi all, I would like to post this because this method has saved me when I upgrade my router with new ios. I used this as a recovery option. This will come in real handy if you are on-site with 128 MB to 1 GB USB Drive.     Format your USB drive with FAT file system. This needs to be FAT and not FAT32   :)     Copy the IOS image to the USB drive.     Power off the router, plug in the USB flash drive to the USB port on the router.     Power on the router and when it starts to boot up press the Break key to enter ROMMON mode.     In ROMMON mode enter the following command to boot to USB:                      boot usbflash0:     (e.g. boot usbflash0:c1800-io3-mz.123-26.bin) When you are upgrading your IOS image after upload it via tftp please check the checksum before you boot from that image. it will help you to upgrade...

First insert the new VWIC card when router is power off. fix screws tightly Connect the T1 cable which is from the ISP side to the controller you want to configure power up the router log in to router using prefer method (telnet / console/etc) configure controller as follow MPLS(config)#controller T1 0/0 MPLS(config-controller)# framing esf MPLS(config-controller)# linecode b8zs  MPLS(config-controller)#channel-group 0 timeslots 1-24 speed 64 In here you have to calculate/inquire the speed before you configure the speed under channel-group. calculate is simple as follows   speed = bandwidth / number of channels if you configure controller then issue a sh run and see the virtual serial is appeared or not. if not you did not configure it correctly or your controller is not active ex: interface Serial0/0:0 then you can configure the serial interface according to ISP given settings after that you can issue sh ip interface brief command and see the interfa...