Transfer files from your PC to Android without an internet connection using a simple camera scan. The Cimbar project uses Reed-Solomon error correction to reassemble and correct errors, allowing for file transfers of up to 33MB.
To use this method, sideload the APK on your phone, then go to cimbar.org and upload a file. Open the app on your phone, line up the viewfinder with the flashing color barcode, and choose where to save the file. This method can reach speeds of approximately 850KB/s, making it an impressive wireless and offline solution.
While there are potential issues like camera shaking or screen glare, the system has built-in error correction using Reed-Solomon codes to recover data. With this tool, you can easily transfer files from your PC to Android without relying on Wi-Fi or a network connection.
Source: https://www.howtogeek.com/this-crazy-pattern-can-transfer-files-to-your-phone