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Why two topics for the same problem?
The "AC 1" at the DMC you get because in the settings of the MultiPlus the "overruled by remote" option (shore limit in the general tab) is not selected.
The other problem can be caused by a weak AC input in combination with the settings for the transfer switch (grid tab).
If you updated the firmware of the Multi without making a backup of the setting (and load the settings after the update) you ended up with all setting at default.
(btw the latest firmware for your MultiPlus is 473)
The password you are looking for is available for everyone:
https://docs.victronenergy.com/victronconnect-vebus.html#firmware-updates
OR
Use VEflash instead of VictronConnect to update the firmware there is no password needed but you have to download the firmware file separately from the Victron Professional Portal.
https://professional.victronenergy.com/
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