Re: SDI record flag...
I have submitted a ticket with Teradek regarding the SDI flag not working with the Bolt 3000 in conjunction with the Alexa and the Atomos Samurai Blade recorders (as well as the tally indicator on a Flanders Scientific CM250 monitor). The Bolt 2000 passes the SDI record flag properly on these downstream devices.
Since the issue was brought up with Teradek, a firmware update was released with notes indicating:
Bug Fixes - Time code and record flags were not recognized by some monitors/recorders
However, the firmware update did not fix the problem for us.