Here is a link to firmware
Icarus-Ereader_V1.0.0-2017112317 for model
Icarus-E785BK that I received from the company today after submitting a support ticket requesting the firmware update.
I connected via USB, placed the update.zip file in the parent directory of My device. Ejected the device from the USB connection. Then I went to
Settings - System update - selected to update
From local memory. The device then rebooted and installed the update without a hitch.