I remember that I had difficulties to downgrade my console when I updated it without burning fuses, I had a copy of the Nand, but it did not work because I had not made a copy of Boot 0 and 1.You always have to be. Just have a full backup and you should be fine for the most.
if you got an iPatched Switch, AutoRCM is off limits for the forseeable future.
If there is still a software modification solution in 8.x I will update it normally or wait for Emunand. I have the first Units that went on the market.