the Pipo X8 uses Intel's Bay Trail-T SoC (Atom Z3736/Z3740), and Pipo never published standalone chipset drivers. The common, reliable workaround is to use Lenovo's official "Intel Platform Device Driver" package for the ThinkPad 8, since it's built on the exact same Bay Trail platform and includes the Intel SST Audio Device (WDM) driver plus the supporting PMIC/I2C/GPIO drivers that audio depends on (Bay Trail audio often breaks after Windows Update because it clobbers these dependency drivers, not just the audio driver itself).
Check Device Manager first — open Device Manager and look under "Sound, video and game controllers" and "System devices". If you see a device with a yellow warning icon (often shows as "SST Audio Device" or an unknown ACPI device), that confirms the audio driver got wiped by the update.
Download the package from the link above (it's a Lenovo-signed installer, not a bare .inf, so it installs cleanly on 32-bit Windows).
Run it as Administrator. It will detect and reinstall: Intel SST Audio Device (WDM), the Power Management IC driver, I2C/GPIO/SPI controllers, and the Dynamic Platform & Thermal Framework drivers — all of which the Bay Trail audio stack depends on.
Reboot after install