Are there old releases of the kitprog firmware and is there an easy way to load them into a kitprog adapter?
New CY8CKIT-059 boards are shipping with version 4.19, the GUI tool will only write 4.18; but, I can only get version 4.11 working under Linux with openocd. I may be able to use something between 4.11 and 4.18, I just know that 4.11 works and 4.18/4.19 don't.
You can look into your local installation of PSoC Creator or Programmer whether there are older firmware versions available.
According to KitProg FW version on CY8CKit-059 older PSoC Programmer versions come with older firmwares and can be used for downgrading.