I suggest you try again, but first do a hard reset.
Download the firmware again and copy to SD card.Turn off the phone, then press and hold the Vol down button for about 2-3 seconds.
Keeping these buttons pressed, press the power button for a short time and release all the buttons.
In this phase choose the recovery option using the Volume Down button to navigate and power button to confirm, chose wipe data/factory reset, confirm, then chose Apply update form SD card.
I hope you can solve
