To solve the issue it is necessary to replace the boot file option (option 67) in the DHCP server.
For environments where BIOS and UEFI are used at the same time, it is possible to set up scopes for the different architectures.
There is always the option to use the internal DHCP server of the SDA or RSA where the scopes and boot files are set correctly.
This option can be found under Settings | Network Settings.
If multiple DHCP servers are used, all DHCP servers need to be updated.