9M2PJU Mod LoRa APRS Tracker

Firmware Web Installer — Heltec Wireless Tracker

Heltec Wireless Tracker (ESP32-S3 + ST7735 TFT)

Click INSTALL, pick your device's USB port,
and the firmware installs right from your browser.

Wrong browser

You need Google Chrome or Microsoft Edge to install. Firefox and Safari do not work. Please switch to Chrome or Edge.

What you get

Callsign: 9M2PJU-7 on all 3 profiles
LoRa frequency: 433.400 MHz (Malaysia)
LoRa label: LoRa[MY]
Clock: Malaysia Time (UTC+8)
APRSMYSunday net check-in (Messages menu)
SOTA & POTA spots and alerts (Reports menu)
Centered text on all screens
Navy blue header bar with yellow text
Cyan menu items, yellow selection indicator
Orange button instructions
Color text for GPS, battery, altitude, messages
White APRS symbol
Status bar: GPS lock / BT / idle
Startup text: "9M2PJU Mod" + version date
GPS Eco Mode off (GPS always active)
Profile 3 symbol: motorcycle

How to install

Use Google Chrome or Microsoft Edge
Plug in your Heltec Wireless Tracker with a USB cable
Click the INSTALL button above
Pick the USB port (usually "USB JTAG/serial debug unit")
Click INSTALL and wait until it finishes
Your tracker restarts on its own with the new firmware

If INSTALL fails or your tracker won't start

If the installer cannot connect, put your tracker into download mode first:

1. Press both buttons together (BOOT + RST). The screen goes blank.
2. Click INSTALL and wait until 100%
3. Press the RST button once to start the firmware

Pressing both buttons together puts the tracker into download mode (screen goes blank). After flashing, press RST once to boot into the firmware.

Heltec Wireless Tracker running 9M2PJU Mod LoRa APRS Tracker firmware

Heltec Wireless Tracker running 9M2PJU Mod LoRa APRS Tracker firmware

After flashing

Press the RST button once to start the firmware (or unplug and plug back in)
Settings are ready for Malaysia (9M2PJU-7, 433.400 MHz)
To change settings, turn on WiFi AP mode on the tracker
Join WiFi: LoRaTracker-AP / password: 1234567890
Open 192.168.4.1 in your browser
To update config only, run: pio run -e heltec_wireless_tracker -t uploadfs

APRSMYSunday Net Check-In

This fork includes Malaysia's APRS Sunday Net check-in feature. Check in to the net right from your tracker — no phone or computer needed.

Go to Messages → APRSMYSunday → Check In
Quick Check In: sends CHECK #APRSMYSunday Net from LoRa Tracker 73!
Custom message: type your own text, sent as CHECK #APRSMY <your text>
Messages are sent to callsign APRSMY via LoRa APRS

SOTA & POTA Reports

Query SOTA (Summits On The Air) and POTA (Parks On The Air) spots and alerts from the 9M2PJU-4 APRS Bot, right from your tracker.

Go to Reports → SOTA → Spots — sends SOTA spots to 9M2PJU-4
Go to Reports → SOTA → Alerts — sends SOTA alerts to 9M2PJU-4
Go to Reports → POTA → Spots — sends POTA spots to 9M2PJU-4
Go to Reports → POTA → Alerts — sends POTA alerts to 9M2PJU-4
Replies come back as APRS messages — read via Messages → Read

Full user guide for 9M2PJU-4 APRS Bot: https://hamradio.my/9m2pju-aprs-bot/