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Modern operating systems and apps expect gigabytes of RAM. The Lumia 520 will instantly freeze or close background apps if memory limits are exceeded.
Wi-Fi stability, Bluetooth, audio routing, and the camera can be highly unstable depending on the specific build version. 2. Windows 10 Mobile (Offline Upgrades)
In the twilight of the Windows era, some developers attempted to port the Android subsystem to Windows Phone. This is highly experimental and unstable on a Lumia 520. It allows running Android APKs natively, but the performance on the 520's 512MB RAM is abysmal. This is recommended only for those who want to experiment, not for a daily driver. Nokia Lumia 520 Custom Rom
Optimized Windows Phone 8.1 ROMs strip out telemetry and bloatware, making the interface fly on the limited hardware.
Use the built-in reset feature (Power + Volume Down) to make it run like new. Modern operating systems and apps expect gigabytes of RAM
Use the WPInternals tool to disable Secure Boot and flash a custom engineering bootloader.
Installing a custom Rom on your Nokia Lumia 520 requires some technical knowledge and preparation. Here's a general guide to get you started: It allows running Android APKs natively, but the
Nokia Lumia 520 Go to product viewer dialog for this item. Custom ROM Guide: Breathing New Life into a Legend Nokia Lumia 520
Today, you can buy a Lumia 520 on eBay for $15, spend an evening flashing Sailfish OS or Windows 10 ARM, and own a conversation piece that defies corporate obsolescence.
In a stunning display of developer skill, Android Marshmallow was successfully booted on the Lumia 520.