Day 3 was completed in ARMv5 (ARM9) assembly and run in the pre-OS firmware context on the ARMv5TE in my New 2DS XL: output.jpg. This is technically the first day this year done in an arch I didn't use last year, but it's a totally boring one since I used ARM7 last year. There will be true new archs eventually, I promise.
I know I'm super behind now, but I'm still planning to catch up and finish everything by the end of the year... hopefully.