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Download area for USB modem
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For files from a quick guide to upgrade tool of 3.75G USB modem made by Qisda, please click on below items to download.
  Download
Quick Guide V.2.0 File(PDF/419KB)
User manual of software File(ZIP/693KB)
H21 software PC tool update V.1.07 File(ZIP/30479KB)

 
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