They are almost always malware. If you want the DIY route, buy the hardware from a reputable e-bike tuning shop. The Official Way to Get a Diagnosis Since you cannot download the dealer software, here is your action plan based on your situation:
STUnlocker (by ST Soft) is a third-party Android/PC app that connects to the Yamaha PW, PW-X, and PW-SE via a Bluetooth dongle (like the ). It allows limited diagnostics, region changing, and speed delimiter configuration. yamaha e-bike diagnostic software download
Author Tip: If you are a technician looking for the actual dealer portal, search for "Yamaha YDT Dealer Portal" – not the software name directly. They are almost always malware