Tachyon Unresponsive: No Status LED, Serial Monitor Locks Up (Ticket #154775)
Hello, I am seeking engineering assistance for a Tachyon unit that has become unresponsive after initial flash and 0 days of use. It was previously "breathing green" but failed a cloud handshake and has since gone dark.
Current State:
Main Status LED: Completely black/off.
Battery LED: Solid Red or "Heartbeat" breathing (depending on charge).
Device Manager: Enumerates as "Tachyon" (WinUSB) and "USB Serial Device (COM6)".
CLI Status: Returns "Missing permissions to access the USB device" or "No serial port identified."
Troubleshooting Steps Taken:
Factory Restore: Successfully performed particle tachyon restore in EDL mode.
Power: Tested with high-power USB-C PD (Thunderbolt 3) and wall chargers.
Battery: Tested with both the large and small battery packs.
Hard Reset: Attempted 10s and 20s button holds with no change to the main LED.
Serial Debug: Opened a monitor on COM6; the cursor flashes but the device is non-responsive to keyboard input, and the CLI eventually freezes.
Drivers: Manually assigned WinUSB and CDC drivers via Zadig.
It appears the processor is alive but the system/OS is failing to boot or initialize the LED and data rails. My ticket is #154775 and my Device ID is 422a0600000000008511d877
First time on here just bought this Tachyon and dread a return any help is appreciated.
I submitted a ticket to support to find out everything runs through the community. was told to dm@support if no response...
