Aspire’s NX75 new firmware V06,users can make the logo with numbers and symbols .
Press "+" or "-" to select letters,press fire button to confirm,"W" button to delete,and button "T" to select among lowercase,capital letter,numbers and symbols.

Download here:
aspirecig.com/upgrade/nx75/390.html
Be aware that the settings after upgrading come to 75 W and 5.26 V, so don't forget to lower that down if you vape at lower levels.
And when upgrading to V6, the C3 setting will start up to 80 Watt but it vanishes as soon as you try to change that.
Thank you! :D
If you updated your NX75 before with firmware version V04?
If yes,you don't need install the update tool again,just open the update tool ,click the update button and choose the firmware V06
Would you try it on another PC?If it is the same problem?
And sorry, but I don't use the TC <:-P