How to remove efi lock password?

Apple ties it in with the EFI firmware, so the RAM and NVRAM reset no longer work (hasn’t worked since 2011). With these you either need to patch the firmware (without screwing up the Intel ME region, otherwise you have a machine that runs at 800MHz permanently), replace the motherboard or go to Apple with POP.

With the Apple Silicon Macs, I suspect it’ll be possible, but in practice impractical even if you know how to do it correctly, like on the Intel machines :-(. The way Apple designed the M Series SoC, Secure Boot and iBoot may mean you can’t do it anymore - whereas on the HP laptops (which yes, ARE just as difficult but if you’re careful is doable) you can dump the EEPROM, decrypt the password, and re-flash the laptop. Admittedly that’s been the case regardless of the vendor on the Windows side as well where other approaches are now required (outside of Purim, otherwise they enable it because most people favor security>modifiable BIOS) since HSW.