You can upgrade your controller ZD3k to build code 10.1.2 which will still support AP ZF7352. These AP model's are not supported from 10.2 and above. Below is the article that would help you with upgrade path which is required while upgrade to keep the current config of system intact.
Note : Always take the backup while upgrade and post upgrade of one code of controller wait for the AP's to update the new code too and then go to next code.
my ZD Version : Version= 126.96.36.199 build 156
OK, it will be reset to factory default, can I restore with backup data from a version before?
because my account was unable to download on a lower version of the firmware. "That file is only available to Premium Support users."