By late 2021, even the Hock Lai builds stopped receiving updates. The 4PDA and XDA threads went quiet. The last few users either repurposed their K004s as dedicated GPS units for old cars or retired them to drawers.
: Use the "SD Download" option in the Droidboot menu to install the firmware from your micro SD card. Limitations in 2021+ asus fonepad k004 custom rom 2021
By 2021, official development for the K004 had largely ceased. Unlike popular Samsung or Nexus devices, the Intel Lexington chipset in the Fonepad presented unique challenges for developers. Most "modern" custom ROMs for this device focus on stability rather than jumping to Android 11 or 12. By late 2021, even the Hock Lai builds
Some anonymous developer—let’s call them GhostintheAtom —had managed to compile a half-working build of LineageOS 14.1 using outdated Intel BSPs (Board Support Packages) and kernel hacks held together with duct tape and hope. : Use the "SD Download" option in the