From the manual:
Safety Boot Feature
Software updates may be made available for the IF-FW/DM MKII
through TASCAM’s web site (
www.tascam.com). When you use
these updates, removing the FireWire cable, or experiencing a
power glitch during the update procedure can leave the card in an
unusable state.
Don’t worry.
The IF-FW/DM MKII contains a second copy of its operating
software that cannot be overwritten by any software updater
application. Each time the card is powered on (by turning on the
mixer), it will check to see if its software is correct. If it is not, the
CARD STATUS will stay at “Booting…” If this stays the same for
more than 30 seconds, use the following procedure to select the
Safety Boot feature
To select this safety boot feature, you first need to remove the card
from the mixer (turn off the power first).
According to the following picture, you will see a plastic connector
pushed onto a pair of upright pins. Next to the pins is the text
“NORMAL”. This is a jumper header, and this is just a place to
store it when it is not being used.
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To use it, pull it up and off of the pins and replace it onto the pair
of pins nearby that are marked “J15 BACKUP”. Push it all the way
down onto the pins. Do not put the header on any other pins on the
card.
Next, re-insert the card into the mixer, reconnect your cables and
turn the power back on. The CARD STATUS display will now
show OK (Backup) to show that the backup software is being
used. You can use the software updater program to re-attempt the
update of the main software, and when that succeeds, revert the
jumper header back to the NORMAL pins to start using the new
software. The backup software is a copy of the factory installed
software, so you can be sure that all the original features will
function in this mode – you don’t need to hurry to go back to
NORMAL if you are under a deadline or other pressure.
If the CARD STATUS still reads Booting … constantly after
changing to the backup software, your card may have a hardware
problem