By flashing a Custom ROM from 2020/2021, you inject modern CA certificates. You can suddenly access Google, Wikipedia, and Reddit again. This is the #1 practical reason to mod your device this year.

If you want to move forward with updating your device, let me know your tablet is currently on: Is your tablet currently rooted , or completely stock ?

to reviving your ASUS Fonepad K004 in 2021 is to focus on what’s actually achievable: root access, custom recovery (if you can find the files), and extensive debloating and optimization of the stock Android 4.1 ROM.

Charge the Battery: Ensure the device is at least 70% charged to prevent shutdown during the flashing process. Top Custom ROM Choices for Fonepad K004

While a custom ROM can drastically improve the software experience of the ASUS Fonepad K004

The most significant benefit of a custom ROM for this specific tablet is the ability to bypass the "outdated OS" wall. By moving to a more modern, lightweight version of Android, you gain:

Transfer the APK to your tablet and install it (ensure "Unknown Sources" is enabled in Security settings).