Ok, new update.
I was able to reboot in recovery mode, after several full days trying without success.
The phone not being connected to USB:
1 - I removed the cover, removed the camera/flash cover to unplug the battery.
2 - I unplugged the battery
3 - left it unplugged when "drained" the cap by "jumping" the 2 connection of the power button with a screw driver for a minute or so.
3 - Then, I plugged the battery back
4 - with one screw driver I jumped the two right connection of the volUp button, then keeping the jump, I jumped th Power button connection for about 10s.
5 - the phone vibrated and rebooting in the Ubuntu Touch recovery
6 - plugged I was able to restart UBPorts flashing. All went well, the phone rebooted couple times itself and is now up and running Ubuntu Touch.