Let’s be realistic. The is a maintenance operation for legacy hardware. If you are spending more than two hours trying to unbrick a 512MB RAM tablet, consider that a used Amazon Fire 7 (2019) costs $30 and runs a modern Android fork. However, for data recovery, educational tinkering, or sentimental value, flashing this firmware remains a valid project.
Always create a dump of your current firmware using Rockchip tools before attempting an upgrade. Check Legacy Forums: Sites like XDA Developers