I have the solution for reading failed -1 problem
1.- Put the printer in recovery mode. To put in recovery mode you must load the firmware and when I start writing the printer you turn it off before it finishes.
2.- When in recovery mode, upload the firmware to the printer from your pc. When charging is complete, the printer will turn itself off.
3.- You turn on and apply the activator "license" and voila !!!
It works perfectly .....
I hope it works for you !!! any questions write me ....