hp 6300 pci-express compatibility issues

[korobass]

As i found out that all the PCI-E slots in this desktop are version 2 and they're not backward compatiblie with version 1 i would like to ask HP if there is a chance for BIOS update that will fix this issue ?

From my side I've tested two PCI-E tuners (TBS 6220 DVB-T/T2 and hauppauge wintv-hvr-1200) which haven't been recognized by this PC.

As i've tested both cards mentioned above on two different Hp desktops, here are details of investigation that only confirms that issue exists for hp 6300.

HP 6000 Pro specification on which tuner is working:

media                     
    description: Low Profile Desktop Computer
    product: HP Compaq 6000 Pro SFF PC (AT492AV)
    vendor: Hewlett-Packard
    width: 64 bits
    capabilities: smbios-2.6 dmi-2.6 vsyscall32

    firmware
          description: BIOS
          vendor: Hewlett-Packard
          physical id: 1
          version: 786G2 v02.03
          date: 10/19/2015
          size: 128KiB

   Type: x1 PCI Express
   Type: x1 PCI Express
   Type: x16 PCI Express 2

HP 6300 Pro specification on which tuner doesn't being recognized in PCI-E slot:

    description: Low Profile Desktop Computer
    product: HP Compaq Pro 6300 SFF (QV985AV)
    vendor: Hewlett-Packard
    width: 64 bits
    capabilities: smbios-2.7 dmi-2.7 vsyscall32

*-firmware
          description: BIOS
          vendor: Hewlett-Packard
          physical id: 0
          version: K01 v03.04
          date: 10/05/2016
          size: 64KiB
          capacity: 15MiB
          capabilities: pci pnp upgrade shadowing cdboot bootselect edd int5printscreen int9keyboard int14serial int17printer acpi usb biosbootspecification netboot uefi

   Type: x16 PCI Express 2 x16
   Type: x4 PCI Express 2 x4
   Type: x1 PCI Express 2 x1

Thanks in advance for any update 

Regards

MarekK