Here’s a concise, critical review of that topic based on common online sources (XDA Developers, official archive sites, blogs, and file hosting links):
“To the one who reaches the top: You’ve proven Android 6 isn’t dead—it’s sleeping. This zip contains no key. The real key is patience. Turn the tablet over.”
Prerequisites:
Developers often package modified versions of Android 6.0 into ZIP files, allowing users to experience a "stock" feel or added features on devices no longer supported by their manufacturers. GApps (Google Apps):
For those who have "bricked" their device or encountered severe software bugs, downloading a factory-image ZIP file is often the only way to restore the phone to its original state. Technical and Security Considerations android 6 download zip file top
Furthermore, the technical process of using these zip files—known as "flashing"—is complex. It requires specialized tools like the Android Debug Bridge (ADB), Fastboot, or custom recoveries like TWRP. A single mistake during this process, such as flashing a zip file meant for a different hardware variant, can result in a permanent "hard brick," rendering the device useless. Consequently, while the availability of Android 6 zip files provides a lifeline for old hardware, it also demands a disciplined approach to technical execution.
OTA zip files are designed to "sideload" an update over your existing system without wiping your data. Here’s a concise, critical review of that topic
Popular projects like LineageOS use these ZIP files as a base for older devices.