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A lot of boxes have a default code that will unlock it regardless of what the code was originally set to. Others have a button sequence (hold button x for so many seconds, hold button x while powering the unit on, etc) that resets the unit to default. This is usually listed somewhere in the manual if you can find it.
Alternatively you may be able to reset it to it's default state by zeroing the NVRAM (by disconnecting the battery), but this will also zero the serial number and channel map "disconnecting" the box. There are various ways to reprogram the box after this, but I don't know if cable hacking is verboten on this board so I'll leave it at that.
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