Access to the FTP server which was producing the error has been resolved. Note that this may not help in updating the firmware on your old XBee 802.15.4 modules as the firmware version 10EC is very old and out dated. You may have to use the recovery function to update it to a more current version.
Yeah, they are old modules I had from 2012 that I just found in a box! Figure I’d give them a run and see which ones still worked well… up to now I have 2 working ones out of 6!
While I was waiting for an answer concerning the firmware package upgrade, I actually ended up using the legacy X-CTU to connect to my older Xbee-S1 running 10EC and updated that software’s firmware libraries with the newest one. This allowed me to change firmware after all!
Do you have a link to information on recovery function?