# Cannot detect COM port when downloading firmware **URL:** \ **Category:** AI\ **Created:** [April 2, 2026, 10:50am UTC](https://community.topst.ai/t/cannot-detect-com-port-when-downloading-firmware/898 "2026-04-02T10:50:16Z")\ **Posts on this page:** 6\ **Page:** 1
**Author:** ![Pinot](https://yyz2.discourse-cdn.com/flex004/user_avatar/community.topst.ai/pinot/32/1001_2.png) [@Pinot](https://community.topst.ai/u/Pinot)\ **Post date:** [April 2, 2026, 10:50am UTC](https://community.topst.ai/t/cannot-detect-com-port-when-downloading-firmware/898/1 "2026-04-02T10:50:16Z")
Hello, I am a student who has been assigned by my teacher to study about AI-G. I have just started learning about the software. In the _Linux SDK Getting Started_ section, I have completed the _Setting Host Environment (Windows)_ and _Image Build Guide_ parts. At the _Firmware Downloader_ step, I have downloaded the VCP Driver, set up Ethernet, checked that my computer has WMIC, connected everything as shown in Figure 4.1, powered on the board while pressing the FWDN switch. However, I cannot see any COM port connection as shown in Figure 4.2. Has anyone encountered the same issue as me? I would really appreciate your help in resolving this problem. Thank you very much. * * * 안녕하세요, 저는 선생님께 AI-G에 대해 조사하라는 과제를 받은 학생입니다. 현재 소프트웨어 부분을 처음으로 공부하고 있습니다. _Linux SDK Getting Started_에서 \*Setting Host Environment (Windows)\*와 _Image Build Guide_ 부분을 완료했습니다. _Firmware Downloader_ 단계에서 VCP 드라이버를 다운로드하고, 이더넷을 설정했으며, PC에 WMIC가 있는지 확인했습니다. 또한 Figure 4.1과 같이 연결하고 FWDN 스위치를 누른 상태에서 전원을 인가했습니다. 하지만 Figure 4.2에서처럼 COM 포트 연결이 나타나지 않습니다. 저와 같은 문제를 겪으신 분이 계신가요? 이 문제를 해결하는 데 도움을 주시면 감사하겠습니다. 감사합니다. ---
**Author:** ![TOPST-manager-cy](https://avatars.discourse-cdn.com/v4/letter/t/35a633/32.png) [@TOPST-manager-cy](https://community.topst.ai/u/TOPST-manager-cy)\ **Post date:** [April 3, 2026, 1:54am UTC](https://community.topst.ai/t/cannot-detect-com-port-when-downloading-firmware/898/2 "2026-04-03T01:54:14Z")
Hello It seems that the VTC driver was not installed correctly. We recommend first uninstalling the currently installed VTC driver and then reinstalling it with the VTC driver for the WIN10 version. Thank you. ---
**Author:** ![Pinot](https://yyz2.discourse-cdn.com/flex004/user_avatar/community.topst.ai/pinot/32/1001_2.png) [@Pinot](https://community.topst.ai/u/Pinot)\ **Post date:** [April 3, 2026, 11:08am UTC](https://community.topst.ai/t/cannot-detect-com-port-when-downloading-firmware/898/3 "2026-04-03T11:08:10Z")
The COM port detection issue has been resolved. I replaced the USB Type-C cable and switched to using the Linux operating system. However, the current issue is that the board does not respond during the flashing process (stuck at “Waiting for SYNC Response”). ```auto ngoclan@ngoclan:~/topst-sdk/output_aig.fwdn$ sudo ./fwdn_ai.sh TOPST AI-G FWDN Shell Script File Input USB Port number :0 Step 1. Connect between Host PC and TOPST AI-G [PrintCurTime:100] 26/04/03-15:52:48 [main:21] FWDN N-Dolphin v1.0.1 - 2024.9.24 16:15:47 [OpenPort:22] Complete open port(/dev/ttyUSB0) [main:92] Start FWDN [ImageSend:441] Complete to send MCERT image [ImageSend:441] Complete to send HSM image [ImageSend:441] Complete to send FWDN_BL1 image [ImageSend:441] Complete to send FWDN_DRAM_PARAMETER image [ImageSend:441] Complete to send FWDN_BL2 image [ImageSend:441] Complete to send FWDN_BL3 image [InfoDevice:123] ############## Device Info ############## [PrintIP:527] ip : 192.168.0.100 [PrintIP:527] mask : 255.255.255.0 [PrintIP:527] gateway : 0.0.0.0 [InfoDevice:132] port : 8080 [InfoDevice:135] mmc0_user: 7818182656 byte block_size: 512 byte mmc0_boot0: 4194304 byte block_size: 512 byte mmc0_boot1: 4194304 byte block_size: 512 byte snor1: 0 byte snor2: 0 byte fw_version: tcc750x_v0.0.111 fw_build_id: g90e2b777 fw_build_date: 2024-09-24-17:11:42+0900 ----- Firmware Information ----- VERSION : tcc750x_v0.0.111 BUILD ID : g90e2b777 BUILD DATE : 2024-09-24-17:11:42+0900 ----- Detail of Storages ----- #### eMMC Info #### Manufacture ID: 0x15 OEM: 0x100 Name: 0x8GTF4 User Capacity: 7.3 GiB (7818182656 Byte) Boot Capacity: 4 MiB (4194304 Byte) RPMB Capacity: 512 KiB (524288 Byte) Speed Mode: HS200 #### SNOR Info #### ----- Summary of Storages ----- eMMC : O SNOR : X - O : Init success - X : Init failed or not exist ----- Summary of DRAM Init ----- DRAM Init : Success DRAM Size : TBD MB ----- PMU Status ----- PMU_USER : 0x0 PMU_SIC_USER : 0x80 PMU_CONFIG : 0x0 * BM : PMU_CONFIG[1:0] - 0 : USB BOOT - 1 : SNOR BOOT - 2 : eMMC BOOT - 3 : eMMC with SIC BOOT -------------------------------- [OpenPort:43] connect() error! [LoadFwdnFW:678] TCP Socket Open Fail ! [main:158] Failed FWDN [main:162] **Notification : For more detailed FWDN Log, use the -g or --debug option. Step 2. Low-format [PrintCurTime:100] 26/04/03-15:54:10 [main:21] FWDN N-Dolphin v1.0.1 - 2024.9.24 16:15:47 [OpenPort:22] Complete open port(/dev/ttyUSB0) [main:92] Start FWDN [StartNDFWDN:120] Waiting for SYNC Response(2) [StartNDFWDN:120] Waiting for SYNC Response(2) [StartNDFWDN:120] Waiting for SYNC Response(2) [StartNDFWDN:120] Waiting for SYNC Response(2) ...[StartNDFWDN:120] Waiting for SYNC Response(2) [CheckResPacket:298] Invalid cmd of res(0x4E445746(START_CMD)) [DumpPacket:327] Dump Packet Cmd type : 0xFFFF0010(ACK) Param0 : 0x4E445746(START_CMD) Param1 : 0x0(Unknown define) Param2 : 0x0(Unknown define) [Chipboot:456] Fail to send MCERT image [ImageSend:441] Complete to send MCERT image [CheckResPacket:298] Invalid cmd of res(0x0(Unknown define)) [DumpPacket:327] Dump Packet Cmd type : 0x0(Unknown define) Param0 : 0x0(Unknown define) Param1 : 0x0(Unknown define) Param2 : 0x0(Unknown define) [Chipboot:463] Fail to send HSM image ``` ---
**Author:** ![TOPST-manager-cy](https://avatars.discourse-cdn.com/v4/letter/t/35a633/32.png) [@TOPST-manager-cy](https://community.topst.ai/u/TOPST-manager-cy)\ **Post date:** [April 3, 2026, 11:22pm UTC](https://community.topst.ai/t/cannot-detect-com-port-when-downloading-firmware/898/4 "2026-04-03T23:22:41Z")
This issue occurs when the network settings are not configured correctly. Please check if the Ethernet connection between the AI-G and the Host PC is correctly set to 192.168.0.8 Thank you. ---
**Author:** ![Pinot](https://yyz2.discourse-cdn.com/flex004/user_avatar/community.topst.ai/pinot/32/1001_2.png) [@Pinot](https://community.topst.ai/u/Pinot)\ **Post date:** [April 5, 2026, 3:24am UTC](https://community.topst.ai/t/cannot-detect-com-port-when-downloading-firmware/898/5 "2026-04-05T03:24:43Z")
![Screenshot from 2026-04-05 10-05-34](https://canada1.discourse-cdn.com/flex004/uploads/topst/original/2X/3/3981ee7d50adfd0ff018b34180aef739c25eedc3.png)Sorry for the inconvenience. I have reconfigured the network settings as instructed, but the issue still persists. ---
**Author:** ![TOPST-manager-cy](https://avatars.discourse-cdn.com/v4/letter/t/35a633/32.png) [@TOPST-manager-cy](https://community.topst.ai/u/TOPST-manager-cy)\ **Post date:** [April 7, 2026, 2:08am UTC](https://community.topst.ai/t/cannot-detect-com-port-when-downloading-firmware/898/6 "2026-04-07T02:08:28Z")
It seems that the issue can be resolved by setting the value of the gateway to 192.168.0.1. Thank you.