Many of you may have the problem that Mac Devices have a terrible display with blurry fonts when connected to an external monitor. To improve the display, we need to simulate the macOS HiDPI on a non-retina display. This article will show you how to do that.
It seems Big Sur has tighten up files permissions. The old way of disabling SIP can't modify system files anymore. But in fact, you can change HiDPI without SIP, mlch911 has modified the script to make it work.
Change Run the script's command
bash -c "$(curl -fsSL https://raw.githubusercontent.com/xzhih/one-key-hidpi/master/hidpi.sh)"to
bash -c "$(curl -fsSL https://raw.githubusercontent.com/mlch911/one-key-hidpi/master/hidpi.sh)". Due to the policy of Big Sur, we no longer have access right to
/System/Library, mlch911 just modified the the path in the original script to