The software found no card, which on the second PC means nothing is bound to the FT601 data bridge. First check that a data-rated USB 3 cable runs from the card's data port, not the flashing port, to a rear port. Then confirm the gaming PC is powered on and booted, and that the FTDI D3XX driver is installed.
Open Device Manager on the second PC. No bridge device at all means a port or cable problem, while a bridge with a warning triangle means a driver problem.
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It means there was no working USB link to the card's data bridge. The trailing zeros in that string show that nothing was read back from the card at all. Check that the cable is in the data port, not the flashing port, and that it is not a charge-only cable. Then check that the gaming PC is on and the FTDI D3XX driver is installed.
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The reader reached your card and read memory, but it could not find the Windows kernel's Directory Table Base inside it. To fix it, first generate a memory map on the current hardware and turn off VT-d/VT-x or SVM/IOMMU in the gaming PC's BIOS. Then prove the USB link is steady and cold-boot both machines.
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The reader found the kernel but could not work out the target process's module base, usually because of a missing or stale memory map. It can also be a stale process handle after an alt-tab, or a shaky read path. Shut both machines down fully and make a new memory map. If the error began right after a game update, wait for the software to be rebuilt for that build.
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That is a missing file, not a hardware fault: the FTDI library is not sitting next to the program. Put FTD3XX.dll in the same folder as the software, using the version shipped with your order. If your order did not include the file, reinstall the D3XX driver package.
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The USB side is working but the PCIe side is not. A version number came back from the card, yet no PCIe endpoint exists on the gaming PC. Power that machine down, reseat the card until the clip closes, and screw the bracket down. Try another slot, then cold-boot the gaming PC before the second PC.
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Because a Windows restart never cuts power to the PCIe slot, so a hung FPGA keeps the state it is stuck in. Shut both machines down fully and wait ten seconds with the mains lead out or the PSU switch off. Then boot the gaming PC first and the second PC after it.
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That pattern points to the USB path or heat, not the firmware. The likely causes are USB selective suspend, a shared controller, a marginal cable or the card warming up in a closed case. Do not reflash anything; instead, change one thing at a time and note when the drop happens, because the timing tells those four apart.
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Windows could not read the device's descriptors, which points to a marginal link rather than a dead board. Remove every hub, dock and extension, and connect directly to a rear USB 3 port with a short data cable. If the error survives two ports and two cables, suspect the socket on the board itself.
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The map file was rejected because it was hand-edited, cut short, made for different hardware, or made while the read path was already shaky. Delete it and make a new one on the current hardware. Never copy a memory map from another person's machine, because it describes their RAM layout, not yours.
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Nearly all ESP lag comes from two causes: a read rate far below what the hardware can do, or a missing memory map. Without a map, the reader works far harder than it needs to. Both can be measured in minutes: test the read speed with the card direct on a rear USB 3 port, then generate a map. Buying a bigger card fixes neither.
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Single-digit MB/s almost always means the link fell back to USB 2 or the cable is charge-only. Swap to a short data-rated USB 3 cable, connect directly to a rear port, and confirm the device shows as USB 3 in Device Manager. Then move other bandwidth-hungry devices off that controller.
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The software looked for the game process and did not find it. The game may still be on a launcher splash screen or in another session, or the reader may be using a stale snapshot. Start the game, reach the main menu, then start the software in the order your product documents. If the game is clearly running, treat it as a read-path fault and make a new memory map.
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That line is a result, not the fault: start-up had already failed above it, so there was nothing to mount. Scroll up in the output to the device or DTB error printed before it, because that earlier line is the one to fix.
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Something else already holds that serial port, usually a second copy of the software, a serial terminal, or a flashing tool left open. Close everything that could hold it and reopen the software. If the error stays, unplug and replug the box so the port comes back fresh.
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The port number in the software is not the one Windows gave the device, because port numbers change when you switch USB sockets. Read the current number in Device Manager and enter it in the software. After that, use the same physical socket every time so the number stays the same.
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Prove the chain one link at a time, in order. The card must be powered, found on the bus and bound to its driver. Then the reader must connect and find the DTB and the process. Finally, features must draw, the input device must move the cursor and the overlay must be visible. Work only on the first link that fails, because every link after it fails anyway.
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Put it all in one message: the order ID, card model and board revision, Windows version and build on both machines, and motherboard model. Add the exact error string as text rather than a screenshot, what changed since it last worked, and what you have already tried. That set gets a diagnosis on the first reply instead of a round of questions.
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