NXH3670ADK Couldn't find kl device and etc

[sheep]

hello. I'm trying to develop an audio module using the NXH3670ADK, but I ran into a problem from the start. First of all I encountered various problems, including one related to the title. So, I would like to ask questions about the problems faced when developing this board.

1. I connected the NXH3670ADK to the computer through a USB port, but I cannot connect using the tools (vcom, flash..) included in the Gaming SDK. (Couldn't find kl device) There was one post in the community related to this issue (https://community.nxp.com/t5/Wireless-Connectivity/NXH3670-Couldn-t-find-kl-device/m-p/956817 ) did not help solve the problem. I connected the Micro USB and ADK board to the board, but why doesn't the tool find the device? I checked and entered the PID and VID of the USB device on the flash board in the device manager, but the connection failed. I'm curious what other elements are needed to connect the device. This problem is similar to the dongle, and the vcom tool or flash tool does not detect it. how to solve it?

2. Flash tool didn't work, so I used MCUXpresso to upload the firmware. I specified the SDK and used a debugging board (Segger J-Link edu). By the way, there are various firmwares in the provided SDK. (kl_headset_adk_headset, kl_headset_usb_adk_headset, kl_ota_headset_adk_headset... more) It was difficult to use because the document did not separately explain what role each project plays and what the firmware is for basic operation.

I would like to know if this part is being approached incorrectly. The flash tool's yaml script defines which firmware should be inserted for various partition hierarchies, but what I did was upload only the kl_headset_adk_headset firmware to MCUXpresso.

In conclusion to this question, I would like to know what I can do to return the ADK board to basic operation. Although it may be possible using a flash tool, recognition via USB connection is still not possible. (couldn't find kl device)

3. My final goal is a structure where the ADK board and smartphone communicate directly with the board without going through a dongle. I wonder if there are any references or materials that make this possible.

Although each question has been lengthened for context, I will summarize it briefly.
1. The NXH3670ADK board is connected via USB, but the SDK tool does not detect it and shows the message 'Couldn't find kl device'. how to solve this problem?
2. How do I return this board to its original state with default operation?
3. Is it possible for the ADK board to communicate directly with a smartphone without going through a dongle?

The summary omits a lot of information and may be difficult to understand, so I would appreciate it if you could check the text.

thank you.