Denso BHT-300B User Manual page 151

Problem
The current download will exceed the maximum allowable number of
files (120 files) in the memory.
Solution
Press the 2 key to return to the SYSTEM MENU, then delete
unnecessary files in the memory (or decrease the number of files to
be downloaded if you attempted to download more than one file in the
DOWNLOAD menu.)
(Refer to Chapter 2, Section 2.5.3, [ 8 ], [ 2 ], [ 10 ], and [ 12 ].)
Problem
Downloading has failed.
Solution
To retry downloading, 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, Section 2.5.3, [4.5] and [5.7].)
It is also necessary to check the communications parameters setup of
the host PC.
Problem
You attempted to download an invalid program file.
Solution
Check whether the program file you attempted to download is
available to your BHT model. If it is not available, download the
appropriate program.
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Chapter 4 Error Messages