Raspberry Pi 3 B+

Amibian 1.4.004 does not run into the newest Rpi. as *a new installation*.

To solve the problem, until a new version is released, you need of an "old" Raspberry Pi 3.

1 - Flash the SD and insert it into the old Rpi 3

2 - apt-get update

3 - apt-get upgrade

4 - apt-get dist-upgrade

5 - apt-get install rpi-update

6 - rpi-update

7 - reboot and when it finished shutdown.

8 - turn off Rpi 3

9 - insert the sd into the Raspberry Pi 3 B+

If you already followed the former steps (i.e. you upgraded the firmware), I guess that you should be able to move the SD directly.

Dave