My Mk3 used to run 3.4.0 but yesterday upgraded to a 3.5.1 firmware with a fan mod to stop it making that nasty whine when printing PETG because the PWM control speed was at an audible frequency.
But it's 'killed' stealth mode, it's so much more noisy now. It doesn't appear to do that accelerate/decelerate thing anymore when moving the axis, just a constant fast motion. I can't differentiate the printing noise levels between Normal & Stealth anymore.
Is that a permanent change to the firmware? If so I might go back to 3.4.0 because the new stealth mode is perhaps more annoying than the fan whine when it was running slower than 100%.