@Zerpie
I solved a similar problem with clonzilla …
…
The second problem was solved with the help of clonzilla:
Problem of changing from uefi to bios while a system in uefi mode was installed.
start clonzille
use the shell
sgdisk -z /dev/sdx
in my case
/dev/nvme0n1
…
Problem 1 “update” solved:
I’ve installed FOG again - now it works 
Problem 2 still unsolved.
I was able to capture and deploy Windows 10 1803 with my old FOG Version.
With 1.5.4 capturing runs normal but the image is marked:
“captured: invalid date”
The reported image size seams ok.
But I’m not able to deploy to another computer.
Now I tested the same type of machine with a brand new installation of debian 9.5 and FOG 1.5.4 - still not working different error:
“Could not fix partition logout (runFixparts)
Args Passed: /dev/nvme0n1”
So the upload process does not start:
"Computer will reboot in 1 minute!
The second problem was solved with the help of clonzilla:
Problem of changing from uefi to bios while a system in uefi mode was installed.
start clonzille
use the shell
sgdisk -z /dev/sdx
in my case
/dev/nvme0n1
I’ve successfully deployed 12 Clients with multisync. But there is a problem:
" * updating Database …"
A HTML file is shown with:
…
<h1>503 Service unavailable</h1>
…
<address>Apache/2.4.25 (Debian) Server at 192.168.1.100 Port 80 </address>
…
" * Reattempting to update database …"
finally
…
“An error has been detected!”
…
“Computer will reboot in 1 minute”
BUT: all 12 Computers are working?! The FOG web page shows that the hosts are imaged: “2018-08-27 20:04:38”
So there are two problems …
-) update on the old system is not working (Maybe it is important that after I updated the system I mounted a new hard disk as /images; then copied the old stuff to the new harddisk)
-) the mysql update after the deploy process is not working on my second brand new FOG server …
Hardware Host:
System Manufacturer LENOVO
System Product 10MNS1QP00
System Version ThinkCentre M910t
System Serial Number S4GN4191
System UUID b1239c00-8e57-11e8-835b-f6931cc12a00
System Type Type: Desktop
BIOS Vendor LENOVO
BIOS Version M1AKT37A
BIOS Date 06/20/2018
Motherboard Manufacturer LENOVO
Motherboard Product Name 3106
Motherboard Version SDK0J40697 WIN 3305129849768
Motherboard Serial Number
Motherboard Asset Tag
CPU Manufacturer Intel® Corporation
CPU Version Intel® Core™ i5-7600 CPU @ 3.50GHz
CPU Normal Speed Current Speed: 3500 MHz
CPU Max Speed Max Speed: 4100 MHz
Memory 7.66 GiB
Hard Disk Model
Hard Disk Firmware
Hard Disk Serial Number
Chassis Manufacturer LENOVO
Chassis Version
Chassis Serial S4GN4191
Chassis Asset