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Reference

Resource URL
Meshtastic web flasher https://flasher.meshtastic.org/
Meshtastic web client https://client.meshtastic.org/
Meshtastic docs https://meshtastic.org/docs/
Heltec Meshtastic (V4) https://wiki.heltec.org/docs/devices/open-source-hardware/esp32-series/esp32-quick-start?esp32=meshtastic
Heltec WiFi LoRa 32 V4 (wiki) https://wiki.heltec.org/docs/devices/open-source-hardware/esp32-series/lora-32/wifi-lora-32-v4/

Verified on this walkthrough

Item Value
Desk board Heltec V4 (esptool: 2MB PSRAM, 16MB flash)
Working flash heltec-v4 2.7.26.54e0d8d (Full Erase, MUI off)
OLED after correct flash SSD1306 found at address 0x3c
USB ID 303a:1001 Espressif USB JTAG/serial
Example serial /dev/ttyACM0 or /dev/ttyACM1
NZ LoRa region ANZ (915); lora.region = 6
Firmware floor ≥ 2.7.25
Phone BLE (desk) Owner Desk V4 / DV4; FIXED_PIN 123456 (change off-desk) — see Phone app
Desk GPS gpsMode ENABLED; Quectel L76K on Expansion Kit ribbon

V4 vs V4 R8 targets: Overview.

Buttons

Control Role
USER / PRG Bootloader hold; wake / menu
RST Reset; bootloader partner
PWR Long press to boot on battery (USB stays powered without it)