# Troubleshooting

## Flea Power Drain/Cold Boot

{% hint style="info" %}
This will resolve most issues with your DMA card.
{% endhint %}

* Shutdown BOTH PCs
* Unplug the power cable from BOTH PCs
* Wait 60 seconds
* Press and/or hold the power button on BOTH PCs to ensure all power is drained from the PC and no LEDs remain lit

## \[FAIL] VMM INIT FAILED. <a href="#fail-vmm-init-failed" id="fail-vmm-init-failed"></a>

The DMA card and/or USB connection is stuck, often due to a fast reboot or system waking from sleep.

<figure><img src="https://3661827449-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2FKDcbGlPDCQPYsgmPubxI%2Fuploads%2FTFHGdWaZyqeHG7hQhyIp%2Fmaxresdefault%20(3).png?alt=media&#x26;token=508fb145-0f45-45eb-ac4c-d8bbfb698a2a" alt="" width="481"><figcaption><p>[FAIL] VMM INIT FAILED.</p></figcaption></figure>

* Perform a [#flea-power-drain-cold-boot](#flea-power-drain-cold-boot "mention")

## FPGA: ERROR: Unable to connect to USB/FT601 device <a href="#fpga-error-unable-to-connect-to-usb-ft601-device-0-v0.0-0000" id="fpga-error-unable-to-connect-to-usb-ft601-device-0-v0.0-0000"></a>

The FTDI driver is not installed or incorrect DMA card port used.

* verify the DMA PC has the [latest drivers](#user-content-fn-1)[^1] installed from [#prepare-windows-1](https://docs.dexa.im/dma/dma-setup-guide/..#prepare-windows-1 "mention")
* verify the USB port being used on the DMA card is the `DATA` port

## Failed to retrieve Physical Memory Map <a href="#failed-to-retrieve-physical-memory-map" id="failed-to-retrieve-physical-memory-map"></a>

Unstable or faulty USB connection.

* Reseat the USB cable on both ends (DMA PC and GAMING PC)
* Try a different available USB 3.2 (or better) port on the DMA PC
* Replace the USB cable; [we recommend a Thunderbolt 4 (or better) cable](https://amzn.to/49dUPoI)
* Perform a [#flea-power-drain-cold-boot](#flea-power-drain-cold-boot "mention")
* On the GAMING PC, [reinstall-windows](https://docs.dexa.im/learn/resources/windows-10-and-11-guides/reinstall-windows "mention")

## \[SYMBOL] Offline symbols unavailable - file 'info.db' not found <a href="#symbol-offline-symbols-unavailable-file-info.db-not-found" id="symbol-offline-symbols-unavailable-file-info.db-not-found"></a>

PCILeech cannot retrieve symbol data for memory interpretation.

* Download the latest version of `info.db` and `MemProcFS` and place them in the same folder as the test tool
  * ufrisk [info.db, ](https://github.com/ufrisk/MemProcFS/releases)[MemProcFS\_files\_and\_binaries-win\_x64-latest](https://github.com/ufrisk/MemProcFS/releases/download/v5.16/MemProcFS_files_and_binaries-win_x64-latest.zip)

## FPGA: TINY PCIe TLP Algorithm auto-selected <a href="#fpga-tiny-pcie-tlp-algorithm-auto-selected" id="fpga-tiny-pcie-tlp-algorithm-auto-selected"></a>

The DMA card is running at slower speeds due to poor USB connection or firmware.

* Reseat the USB cable on both ends (DMA PC and GAMING PC)
* Try a different available USB 3.2 (or better) port on the DMA PC
* Replace the USB cable; [we recommend a Thunderbolt 4 (or better) cable](https://amzn.to/49dUPoI)
* Re-flash the card's firmware
  * sometimes, re-flashing the same firmware will not resolve this. To validate the card is not experiencing issues:&#x20;
    * flash a test/diagnostic firmware
    * run a test on the card using the test tool
    * verify the card tests OK
    * re-flash your firmware
    * test again, verify the card tests OK
* Perform a [#flea-power-drain-cold-boot](#flea-power-drain-cold-boot "mention")

## \[CORE] Initialization Failed. Unable to locate valid DTB / auto-identify OS <a href="#core-initialization-failed.-unable-to-locate-valid-dtb-auto-identify-os" id="core-initialization-failed.-unable-to-locate-valid-dtb-auto-identify-os"></a>

Incorrect BIOS settings or unstable USB link.

* Review **all required BIOS changes** on the **GAMING PC:** [#disable-virtualization-iommu-etc](https://docs.dexa.im/dma/dma-setup-guide/..#disable-virtualization-iommu-etc "mention")
* Reseat the USB cable on both ends (DMA PC and GAMING PC)
* Try a different available USB 3.2 (or better) port on the DMA PC
* Replace the USB cable; [we recommend a Thunderbolt 4 (or better) cable](https://amzn.to/49dUPoI)
* Perform a [#flea-power-drain-cold-boot](#flea-power-drain-cold-boot "mention")
* On the GAMING PC, [reinstall-windows](https://docs.dexa.im/learn/resources/windows-10-and-11-guides/reinstall-windows "mention")

## FTDI SuperSpeed-FIFO Bridge

* verify the DMA PC has the [latest drivers](#user-content-fn-1)[^1] installed from [#prepare-windows-1](https://docs.dexa.im/dma/dma-setup-guide/..#prepare-windows-1 "mention")
* verify the USB slot being used on the DMA PC is at least USB 3.2 or better
* manually uninstall the `FTDI SuperSpeed-FIFO Bridge` device in device manager
  * right click -> uninstall device
  * click `Action` menu -> `scan for hardware changes`
  * validate the device shows correctly in device manager
* verify the GAMING PC is fully updated and no Windows updates are pending

[^1]: You will need to verify the DMA PC has the FTDI chip drivers, WCH CH341 and CH343 drivers.