ZYXEL SWITCH XS3900-48F firmware needed

Hi, I am a happy user of the

recently I made some confiuration changes and probable unfortunatelly experienced a firmware fault or deletion from partition in switch memory.

I am trying to copy the firmware to the switch over console as I successfully did it with my other switches in the past couple times, but the the next one problem I am experiencing, the firmware file seems be no more available ?

ftp://ftp.zyxel.com/XS3900-48F/firmware/XS3900-48F_400AAEW0C0.zip

ftp://ftp2.zyxel.com/XS3900-48F/firmware/XS3900-48F_400AAEW0C0.zip

Also my ftp client says XS3900-48F no more available on ftp?

Could kindly somebody share with me the firmware so that I can bring back my XS3900-48F ? Dropbox download will be also a solution to me.

Thank you!