The problem can be fixed with a firmware update, but you need to find a computer with a Gen 3 or Gen 2 slot to do the programming.
If you have access to a PC like that, download the firmware updater for ASMedia and unzip it.
Inside you will find the asmedia_fw_240322_70_02_40 folder.
This folder has the updater application, ASMTxHCI_MPTool.exe, and the new firmware binaries.
Run the ASMTxHCI_MPTool.exe. It should look like this:
To use the updater, you must first unlock it with the “Unlock MP Tool” button.
You will then be asked for a password, which is asmedia.
After that, you can select the board from the list at the bottom (there should be only one board), and press start.
If successful, you will see “PASS” in green under “Update” and “Check”:
You can now power down the PC, and move the board to the new POC with the Gen 4 slot