Recently upgraded the new MacBook Pro，Already using m1 pro chip。 but，Old style 2015 I don’t plan to sell my old notebook，After all, when I bought it, it was second-hand，Now the battery has also been replaced by two，The hard disk has also been changed to NVMe by adding a conversion head. 。It’s also very good to install it as Windows and play a dozen games.。
But encountered a problem when entering recovery mode，M1 chip equipment has greatly simplified this operation requirement，Just keep pressing the power button，All startup options will pop up，No more complicated key combinations，But an Intel chip Mac still needs：
Combination key description
- Command (⌘)-R: Use the built-in recovery image for system recovery，If there is no built-in recovery image，I got it online；
- Option-Command-R Download the latest recovery mode image online，But there may be various reasons that your motherboard firmware is too old，No way to start a new recovery mode；
- Shift-Option-Command-R Download the oldest recovery mode image online，Is the version of the current device when it leaves the factory，At least it won't open，But it is estimated that there is a lack of support for NVMe，Can't find the NVMe hard drive。
- Option (⌥) or Alt: Boot options，Will show all supported boot options，Older Macs will directly display the built-in recovery mode startup items。
- Option-Command-P-R: Reset PRAM，Can fix most strange problems；
- Shift (⇧): Start in safe mode，Will not load third-party drivers or the like；
- D: Hardware detection mode，Help you detect if the hardware is malfunctioning；
- Option-D remote network startup。
- N: Remote mirroring start；
- T: Boot in target disk mode；
- Command-V: Start in debug mode，Show startup information。
References
- https://support.apple.com/en-au/HT202731
- https://support.apple.com/en-au/HT204904
- https://support.apple.com/en-au/HT201255
Original article written by LogStudio：R0uter's Blog » Mac startup key combination recovery mode recovery mode
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