Download and open Etcher and flash from file just downloaded - select your Micro-SD Card drive and flash the image. Lexar LRW450U LRW500U Card Reader Update Tool V1.
I have been able to add a few of the boxart images I have by going through the recalbox manager, however don't want to do this one by one for the 5,000+ games i have uploaded. Most users should use this image to install FreeDOS. This program is designed to write a raw disk image to a removable device or backup a removable device to a raw image file.
