@Willx I don't remember what android it was running originally.
I used this release from @Nick A https://github.com/NickAlilovic/build/releases/tag/20241007
flashed it onto a microsd card, stuck into the microsd card slot. It boots right into Armbian with Wifi and Bluetooth working. I than used armbian config that you can start from the GUI and flashed the whole thing onto the device's own Emmc storage. Now I don't need the SD-Card anymore.
The Model I have is the 8k Transpeed Ultra HD https://www.aliexpress.us/item/3256805753177410.html?spm=a2g0o.productlist.main.49.4e2cvvt0vvt0XU&algo_pvid=498e6e43-548c-42f9-a41e-5907b1b29398&algo_exp_id=498e6e43-548c-42f9-a41e-5907b1b29398-24&pdp_npi=4%40dis!USD!47.83!20.56!!!338.53!145.57!%402101c5b217306953159191252ed08f!12000034941020300!sea!US!1721927299!X&curPageLogUid=aksBgGStl7UU&utparam-url=scene%3Asearch|query_from%3A
it has 4gb ram and 128gb rom.