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I have a gobi2000 3g wwan card installed in a openwrt router,
gobi_loader(http://www.codon.org.uk/~mjg59/gobi_loader/download/gobi_loader-0.7.tar.gz)
download Verizon firmware always failed. In linux-desktop, gobi_loader
include in modemmanager, so I make this bug report.

After do some usb monitor I found the magic4 package error when download apps.mbn file. This magic package(81bytes) less a byte than download firmare in windows(82bytes):
http://www.zimagez.com/zimage/screenshot-02122014-022251pm.php

With several attempts, I think should encode all magic package same with ppp protocol, use 0x7d as an escape character as this:
0x7e -> 0x7d 0x5e
0x7d -> 0x7d 0x5d

It works fine with my router and laptop even with CDMA or GSM service,
hope it can helps for someone with same issue. Here is the github
project of my fix: https://github.com/kicer/gobi_loader. Maybe this fix
should commit to branch after review. Thanks!

** Affects: gobi-loader (Ubuntu)
     Importance: Undecided
         Status: New

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gobi_loader load Verizon firmware failed
https://bugs.launchpad.net/bugs/1279203
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