Hacking HSDPA’s modem from DealExtreme

What device ?

This one

Under which conditions ?

On Debian Linux wheezy (actually ARMv5, but any flavor would do)

What to expect ?

  1. Use the modem — minimum goal
  2. Send an receive SMS
  3. Place and answer a call
  4. Establish data connection

What were the pitfalls ?

  • The modem comes from China without a IMEI set. This prevents using it in most country in the world.
  • The modem does not appear as a modem to the operating system until it’s forced to do so.
  • The modem uses a non standard, non documented protocol
  • The chinese software is buggy and freeze the computer which make it hard for reverse engineering

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