Excuse me sir
Dummy user here, trying to jump from 1.3 to latest
Reading your guides, I understand you can do a dirty upgrade in the "update rom" guide section, by just copying ROM.zip and Firmware.zip to phone, and this way you dont lose any actual data, just like an ORM update would be

Is that correct? I need a complete wipe instead?
...
And, stupid question here:
You can remember me how to flash the new rom?

Thank you in advance for your patience :S

EDIT:
I only need reasurance in order not to have a brown alert moment
I understand I have to install it via TWRP, and I dont need to update TWRP flasing everything in the process