ftp.ntua.gr:/debian/dists/unstable/main/installer-armhf/20210415/images/u-boot/Firefly-RK3288/?C=N&O=D 
Icon  Name                                                                Last modified      Size  
[DIR] Parent Directory                                                                         -   
[   ] u-boot.img.gz                                                       15-Apr-2021 01:06  273K  
[   ] idbloader.img.gz                                                    15-Apr-2021 01:06   32K  
[   ] Firefly-RK3288.sdcard.img.gz                                        15-Apr-2021 01:06  315K
Apache/2.2 Server at ftp.grnet.gr Port 80