How-to: 3G modem ONDA MT503HS (aka ZTE MF632) and DD-WRT

--- Warning ---
Do not update the firmware of the usb modem or the following procedure will not work!
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In December I will be back to Italy with my wife to spend the holidays with my family but I'll need to keep an eye on my servers in Brazil so I will need an Internet connection for 1 month but this is impossible in my country... so I decided to use a 3G modem with my brand new TL-WR1043ND wireless router.

Debian on a 256 MB flash memory? Yes, we can!

While I'm still trying Linux Mint 13 Cinnamon on my notebook I've started a new project: configure a full NAS operating system based on Debian within 256 MB to store on the internal flash memory of my Acer EasyStore H340.