@Anima You can use another Arduino as a programmer, and using Arduino IDE you can load the boot loader. I suggest to use OptiBoot as it's smaller, although technically for the Uno it works well with the Nano as well since they share the same ATmega328p chip.
There are many good resources explaining the process, so I won't try to repeat that here. Here's some good information to get started:
Update - I noticed one of the stepper motors was having trouble moving in one direction (hence the lack of y axis movement). When I took off the belt, the drive gear on the issue motor fell off. Turns out the grub screw holding the drive gear wasn't on tight enough and was slipping around the stepper motor shaft. Now that it's on properly the unit works like a charm!
Enable Sketch (Hatch) on the Mode menu, and I also recommend using DXF Optimizer so both the design and hatch is performed as quickly as possible - the downside is it can be a slow process on larger or detailed jobs.
This works for raster to vector, DXF and Sketch drawings.
You can set the distance between them, and the style (horizontal, vertical, angled either direction, and cross hatch as square or diamond).
@Chase-Woodhams The forum was hacked some time ago and a lot of the old posts were lost. That's the reason you get the message, sorry but it no longer exists. T2Laser includes several different firmware, including the EleksMana hex.