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Firmware Ver. 4.03 (DV91000107T: released on 26 Apr., 2021) has the following problem.
The camera does not work after updating from Ver. 2.53-* or earlier to Ver. 4.03.
(* Ver. 2.53- DV91000107P: released in Oct., 2018) There is no problem in updating from Ver.3.
This problem has been fixed in Ver.4.04. 　

\|	Software Version	\|	Installation Procedure		Size	\|	Release Note	\|	Last Update
	4.04-00-0.00 Download	\|		\|	40.6MB	\|		\|	May 18, 2021

Firmware Ver. 4.03 (DV91000107T: released on 26 Apr., 2021) has the following problem. The camera does not work after updating from Ver. 2.53-* or earlier to Ver. 4.03. (* Ver. 2.53- DV91000107P: released in Oct., 2018) There is no problem in updating from Ver.3. This problem has been fixed in Ver.4.04.
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