Some of the strings used to be EFI development kit under /OvmfPkg/SmbiosPlatformDxe/SmbiosPlatformDxe.c
For Seabios, change :
Bochs & BXPC inside of src/config.h ( multiple occurances )
/QEMU\/Bochs/ & qemu inside of vgasrc/Kconfig
/06\/23\/99/ inside ofsrc/misc.c
/04\/01\/2014/ inside of src/fw/biostables.c
"s/01\/01\/2011 inside of src/fw/smbios.c
seabios inside of src/fw/biostables.c
5B 93 B6 26 11 BA 6C 4D C7 E0 22 74 7D 07 D8 9A 33 2E 8E C1 E9 54 44 E8 9F 7B FA 0E 55 A2 B0 35
0B C9 66 5C C1 EF 1C 83 77 16 D2 A9 2D 3D 88 D0 E3 63 3E F7 99 8A F4 1D 4F B1 AA 44 05 D8 60 6B