Have a unique issue after your update? Leave a comment on the Anycubic subreddit or open a ticket with Anycubic support—mention your motherboard version and the exact file name you used.
If you've recently replaced your touchscreen and are seeing a black screen, a firmware update is often the required fix to sync the new hardware with the motherboard. Movement Calibration: anycubic m3 max firmware update
Sometimes a new update introduces bugs (e.g., slower USB read speeds). Can you roll back? Have a unique issue after your update
Some updates address "odd behavior" during the lowering phase of a print, which can shave seconds off each layer. Anycubic Wiki Step-by-Step Update Guide anycubic m3 max firmware update