have you tried cw?
mine is V6.1 and the keying with a paddle was awful
has that been fixed? or is it just me?
i think when i got mine it had been upgraded to where the display was not super slow but i cannot tell if it has changed since then
(been trying for most of today to try and get a nextion display working, spent a long time with a usb cable with the right kind of end that i had for a raspberry pi, but i think that cable only sent power, so it was not seen by the pc and got no com port and couldn't get close to having xloader work....)