telnet works different, but when you already have troubles to do a telnet connection and enter the mkfs.... command you maybe should not extend your image and use it as it is without too many plugins that you will have troubles to use properly.
And if you already used flashexpander the device is blocked and unusable for flodder. Flash a fresh image and start again.....
And if you already used flashexpander the device is blocked and unusable for flodder. Flash a fresh image and start again.....