...and as long as this thread has taken this turn, I'll bring up some past Tascam history which is the original source of my complete loss of confidence in Tascam product support...
They released the DR100 (not mkII) with a low voltage cut setpoint that cause the unit to run for a very short time on phantom power from internal AA batteries before it would cut out on low power due to the fairly rapid drawdown in voltage when the unit was pulling the highest current. They issued a firmware update to the DR100 which fixed that issue.
They then released the DR100MKii WITH THE SAME ISSUE but without the firmware update! They were informed AT LEAST four times by me that users would like to have the same update made for the DR100MKii. I never received a response, and even though they issued firmware updates, they never fixed this issue.
This seems to be a broken record theme with this company. Rush the next generation version out the door without concern for addressing the design warts on the previous version.