ftp.ntua.gr:/debian/dists/stretch/main/installer-armhf/20170615+deb9u9/images/u-boot/Firefly-RK3288/?C=S&O=D 
Icon  Name                                                                      Last modified      Size  
[DIR] Parent Directory                                                                               -   
[   ] Firefly-RK3288.sdcard.img.gz                                              12-Jul-2020 20:49  208K  
[   ] u-boot.img.gz                                                             12-Jul-2020 20:49  191K  
[   ] u-boot-spl.rksd.gz                                                        12-Jul-2020 20:49   17K
Apache/2.2 Server at debian.noc.ntua.gr Port 80