Denso BHT-8000 User Manual page 136

Problem
Uploading has failed.
Solution
To retry uploading, press the 1 key.
To return to the SYSTEM MENU, press the 2 key. Check the interface
port, communications parameters, and communications protocol in
the SET SYSTEM menu or perform the communications test in the
TEST menu. (Refer to Chapter 2, Subsection 2.5.3, [4.5] and [5.7].)
It is also necessary to check the communications parameters setup of
the host computer.
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