Flash to V4.8.0.4. But Serial output is broken (System and PXE) . Only Identification and Menu is printed out and after this no further output. But OS and PXE is booted.
Reflash with a SPI-programmer to V4.8.0.3. all is fine. After this i try V4.8.0.4. a second time but the same result.

Output of V4.8.0.4. ( yes it prints out V4.8.0.3)
PC Engines apu1ress ENTER to boot or TAB to edit a menu entry
coreboot build 20183108
BIOS version v4.8.0.3

PC Engines apu1 setup v4.6.9

Boot order - type letter to move device to top.

a USB 1 / USB 2 SS and HS
b SDCARD
c mSATA
d SATA
e mPCIe1 SATA1 and SATA2
f iPXE (disabled)

r Restore boot order defaults
n Network/PXE boot - Currently Disabled
u USB boot - Currently Enabled
t Serial console - Currently Enabled
o UART C - Currently Enabled
p UART D - Currently Enabled
w Enable BIOS write protect - Currently Disabled
x Exit setup without save
s Save configuration and exit