Developers provide an MD5 hash alongside the download link. After downloading, you use a tool to generate a hash from your local file.
If your local hash matches the developer's hash exactly, the file is perfect. If even one character is different, the file is corrupted or has been tampered with and is unsafe to install. Where to Download Android 7.0 Nougat android 7.0 md5 download
An MD5 (Message-Digest Algorithm 5) checksum is a unique 32-character string of letters and numbers that acts as a digital fingerprint for a file. Developers provide an MD5 hash alongside the download link