It runs Windows 10 but it is kInd of slow, but I was able to install Linux on it and even use HQPlayer (not all algorithms, though). Since I bought it, I experiemented for a while then I stopped using it, as due to Covid I was at home using my desktop setup. This is the AK4499 version (the new version is ESS9038). You can check my impressions on the W1 thread. The photos are not great but I am too tired to redo them right now. Maybe some other time.
There is no valid warranty anymore. No trades.

Features of YinLvMei W1:-
>Dual AK4499 Flagship DAC chipset.
>8 OPA 1612 IV converter.
>2 OPA 1612 LPF.
>Amplification Circuit: 2 Custom Dual OP AMPs+8 in-line High-power tube pairs.
>Intel Atom X5 Z8350 CPU.
>4GB RAM.
>128GB Internal Storage.
>Dual-Band Wi-Fi Connectivity(2.4GHz/5GHz).
>Bluetooth V4.2 Connectivity.
>7” IPS Display(800*1280).
>0.66” OLED secondary display.
>Two 7000mAh Lithium batteries.
>Replaceable battery module.
>3.5mm Coaxial, 3.5mm Single-ended LO, 3.5mm Balanced LO, 3.5mm Single-ended PO, 4.4mm Balanced PO.
>Dual PGA2311 Fully Balanced Volume Control.
>Output Power(Single-ended): Up to 750mW @ 32Ω, Up to 80mW @ 300Ω.
>Output Power(Balanced): Up to 1500mW @ 32Ω, Up to 160mW @ 300Ω.
>Line-out Voltage(Single-ended): 2.9Vrms.
>Line-out Voltage(Balanced): 5.8Vrms.
>Output Impedance(Single-ended): 0.8Ω.
>Output Impedance(Balanced): 0.4Ω.
>3 MicroSD card slots with up to 1TB MicroSD card support in each slot.
>2 USB ports.
>USB Type-C charging port.