Only found some french and italian 3d forum posts, google translate suggests some people had issues with the axis moving, etc. ​4​

Anycubic has gathered a strong R&D team from domestic to overseas.

For higher currents use a heat sink that nearly fills the top PCB side and a cooling fan. A simpler, smarter and more practical philosophy has been applied to create high-quality 3D printers to meet professional and daily life needs.Our goal is 'The most popular 3D printer brand' based on quality products, fast service and innovative functions to improve living quality and contribute to social development.

TMC2209: A small heat sink placed on the top PCB side is suitable for currents up to 1A RMS. The Anycubic i3 Mega is a solid, metal-framed 3D printer that comes mostly assembled.It is capable of producing high quality prints. Stable construction and fine layer resolution down to 0.05 mm. Got a "Trigorilla V0.0.2" board in my 2020 Anycubic i3 Mega S. It's 8-bit (Atmel Meg2560), anyone successfully flashed Marlin 1.1.9 on this?