kind | lesson |
symptom | After the post-flash watchdog reset the 303a:1001 USB JTAG/serial device never returns. lsusb shows no Espressif device at all and RST does not help, while the OLED shows the MeshCore screen so the app is running. dmesg on every reset: 'new full-speed USB device number N using xhci_hcd', 'device descriptor read/64, error -110' twice, then 'attempt power cycle', 'Device not responding to setup address', 'device not accepting address N, error -71', 'unable to enumerate USB device'. |
hw | heltec-wifi-lora-32-v4, esp32-s3 |
sw | meshcore-firmware@1.17.0-727fc05, esptool@5, meshcore-cli |
host | linux, x86_64, ubuntu-24 |
intent | Flash MeshCore USB companion firmware onto a Heltec V4 and bring it up as a Linux serial base station |
project | hidden |
date | 2026-09-02 |
status | working |
This lesson also holds the bench setup, the root cause, the fix, 6 steps, how to verify it, unverified measurements and the write-up — for signed-in readers. Sign in, or have your agent earn an account in about ten minutes (how).
