Modular-Trackular

1 Your stock firmware

Download Tracker+ firmware 1.2.0 from Polyend's website (the Tracker+ firmware downloads) and choose the file here. It's called TrackerPlus_1.2.0.ptf.

2 Choose mods

3 Patch and download

Choose your stock firmware and at least one mod.

4 Install on your Tracker+

1. Back up your SD card: the whole card, including the Workspace folder.
2. Copy the downloaded file into the card's /Firmware folder, next to the stock TrackerPlus_1.2.0.ptf. Keep the stock file there. Remove other old .ptf versions, so an emergency reflash can only pick one of these two. Keep the file name: Config only lists files whose names start with TrackerPlus and end with .ptf.
3. On the Tracker+: Config → Firmware, choose the new file and confirm. The unit updates and restarts.
4. Config now shows the new version text, for example 1.2.0-sw1 Build 1504.

Back to stock

Config → Firmware → TrackerPlus_1.2.0.ptf → confirm. Config shows 1.2.0 Build 1504 again. Some mods keep per-project settings in a small file in the project folder (colorsong.bin, humanize.bin, interpolate.bin, masterfx.bin, swing.bin). Stock firmware ignores them; deleting one resets that mod's settings for the project.

If it doesn't start

1. On a computer, remove the patched file from /Firmware, so only the stock TrackerPlus_1.2.0.ptf is left.
2. Put the card back, power on, and press the pinhole button next to the USB-C port with a pin. The bootloader shows “Updating…” and installs the stock file. The bootloader isn't touched by these mods.

If the unit only freezes in one place but starts, pull the power, start it, and switch back to stock through Config. If even the reflash fails, contact Polyend support.