i'm using ctrbootmanager now and i got 70% and 90% boot rate on my 2 N3DS's now. the 70% one has a 64GB micro sd card so i think that's why its failing more.Use a bootmanager(bootctr or ctrbootmanager) and mess with the delay/autobootfix. Also try the 2.6 ropbin payload for your system or the 2.1/lesshax payloads for your system. The different payloads will help with menuhax failing and the bootmanagers will help with the cfw failing
what is this 2.6 ropbin though?