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I have a lot of experience now with the receiver.
If he bought one for $25 that is, needless to say, a great price.
The 3688 is a fairly new receiver which does blind scan to find the active transponders for you. Depending on when that unit was received, you need to upgrade the firmware to fix some bugs.
Upgrading is easy. All you need is a standard serial cable and some software available on the internet. A special program is used to do the uploading of the new firmware.
I can help you if you want to do it.
-Brian
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