B650 Steel Legend WIFI GPU compatibility

Topic: ASRock B650 Steel Legend Wi-Fi: PCIe 5.0 compatibility issue with MSI PCI-E 5.0 RTX 5070 Ti 16GB Gaming Trio + AMD Ryzen 9700X

Problem: If the PCI-E 5.0 MSI RTX 5070 Ti 16GB Gaming Trio graphics card is installed in the PCI-E 5.0 slot, the monitor does not receive a video signal from it (a black screen that does not even show the initial boot, not to mention Windows). The serviceability of the graphics card is confirmed by its seller by diagnostics in his service center (but in a different bundle, not with such a motherboard and not with such a processor). At the same time, if you install a PCI-E 4.0 ASUS RTX4070 Dual graphics card in the same PCI-E 5.0 motherboard slot, there are no problems, everything works as it should. Also, if the MSI PCI-E 5.0 RTX 5070 Ti 16GB Gaming Trio video card is moved to the slower (lower) second PCI-E 3.0 slot, then, as a rule, it initially displays an image on the monitor, but after rebooting Windows, it also shows a black screen on the monitor (no video signal). It was experimentally established that if, during the black screen, the video cable (HDMI or DP, it doesn't matter which) is switched to the motherboard video output (let me remind you that the AMD Ryzen 9700X processor has its own video core), the image will appear on the monitor, but only the integrated graphics of the AMD Ryzen 9700X processor will be shown in the device manager. That is, Windows does not see the MSI PCI-E 5.0 RTX 5070 Ti graphics card, since it has not been initialized yet before Windows boots, since the ASRock motherboard BIOS thinks that it is not in the PCI-E 5.0 slot and therefore switches to the integrated graphics of the 9700X processor, even if the graphics value in the motherboard BIOS is set to External, not Internal, and the generation of the graphics card in the PCI-E 5.0 slot is set not to Gen5, but Gen4 or even Gen3.

My conclusion: there is a problem with the BIOS of the ASRock motherboard in terms of its compatibility with Nvidia RTX 5*** graphics cards, at least the MSI brand. MSI technical support informed me that some motherboard manufacturers quietly and without announcement removed support for the PCIe 5.0 slot in the latest BIOS of their motherboards with the B650 chipset, and perhaps that is why the MSI RTX 5070 Ti graphics card cannot work on my ASRock motherboard as it should, that is, in the PCIe 5.0 slot and in Gen5 mode. I checked the BIOS versions 3.25, 3.30 of the motherboard - this incompatibility is present on both versions (black screen). I did not install earlier BIOS versions, since I do not have an uninterruptible power supply for such experiments. As for the vBIOS of the MSI RTX 5070 Ti graphics adapter, it exists in a single, factory version and no updates are expected so that I could test my configuration with the new vBIOS.

What I did to try to solve the problem:
In the motherboard BIOS, I disabled the integrated graphics of the processor, forced the priority of the external (discrete) graphics over the integrated one (although this is set by default), set Gen4, Gen3 instead of Gen5 for the video card.
Changed monitors, changed video cables, changed video outputs, cleared the CMOS on the motherboard by removing the battery with a pause of 1 hour, by closing the contacts of the Clear CMOS jumper, reflashed the BIOS back from the factory v.3.25 to 3.30 and back.
Completely disconnected the power supply and removed the power cables to the video card (although additional power is not needed to identify the problem, since during the initial boot, the video card only needs 75W of power from the PCIe slot, you can immediately see whether the video card outputs a signal to the monitor or not)

Installed the latest driver from Nvidia, although there is no point in this, because the black screen does not appear after Windows boots, but immediately after turning on the computer.

All the above measures did not help at all.

My PC, in which this problem occurs:
ASRock B650 Steel Legend Wi-Fi motherboard (BIOS v.3.25, v.3.30 - the version does not matter, since the problem persists with any of these versions)
New working power supply -Chieftech Polaris 3.0 (850W Gold Plus, ATX 3.1, 600W video cable for Nvidia RTX 5 video cards***)
New working RAM G.Skill kit 2*16GB DDR5@6000 CL28 EXPO Flare X5 (the memory profile does not matter, since the problem persists with any profile)
New working AMD Ryzen 9700X processor with integrated video core
Windows 10 LTSC 64-bit with the latest updates as of August 13, 2025
Latest Nvidia driver as of August 13, 2025
4TB SSD drive Kingston KC3000.

I would be grateful for any advice on the matter.
And is there a chance to wait for a new, corrected BIOS from ASRock for the motherboard in the foreseeable future?

You can't use NVidia's own GPU UEFI Firmware Update Tool?
I read something about RTX 5000 series having various issues with PCIe compatibility when they launched.