Apologies @haresfur, I did not see your question. Correct voltage for the LiPo is 4.15. I did some investigation around the analog reference settings but this is the same for both versions. (The main difference in 1.6.5 seems to be an #ifdef to support SAMD51 devices) My application is battery-powered IoT so power consumption is the main issue keeping me at 1.3.0… I have not had time to test with the more recent 1.7.x board-support.