Re: PC to tablet installing
Copy apk to your device storage.
Enable installation of application from unknown sources to do this go to settings - security - tick Unknown Sources
Run the apk file by browsing through your device file manager
Roms are very different as compared to apks. They require winrar/ winzip/7zip flashing tools like odin or a custom recovery installed on your device whereas apks just need to be transferred to the device and opened by file manager/ explorer at most they need is root privileges for selected applications
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