Logitech MX518 Legendary, model number MU0053 (G-series refresh), black version ("Nightfall").
Very lightly used (almost unused?) but not working when received, enumerating with VID 0, PID 0.
- 64 kB FLASH
- 8 kB RAM
- 2 kB EEPROM (pretty rare from STM32)
- LQFP64 - seems like there would be many unused pins
- currently not recommended for new designs
I've measured DATA- line capacitance from both ends and it turns out it was very low (~17 pF) near USB plug. This plug did not look well anyway, with two pins sticking out, so I've cut cable few centimetres from the plug.
In hindsight, I could probably avoided opening mouse altogether if I would have thought of measuring cable capacitance first.