FWIW I recently updated a pair of DSP3100s to v1.30 as a condition of selling them. I was lucky, everything went well.

I see from your signature that you plan to upgrade to an MC200. The only audio change to DSP3100 that v1.30 firmware brings is support for Apodising. Since the MC200 already supports Apodising maybe you should consider leaving your DSP3100s at v1.10

Main: 861v8+ID41, 218, HD621, DSP8000SE u, DSP7200SE u, DSP7200HCSE u, Oppo BDP103D, LG OLED557BV.
Second: 218, DSP3200, DSW.
Other Rooms: 1) F80 + MS200. 2) F80 + MS200, 3) F80 + R Pi. 4) F80 + R Pi, 5) F80 + R Pi
Vintage: 207 CD Pro, Lecson AC1 + FM1 + AP3 MkII, Quad ESL 57s