How to reset your password in Raspberry PI when it you forget about the password?

Hardware

-Raspberry Pi 4 Model B

Problems

• Working on Raspberry Pi recently on my robotics project, I altered /etc/rc.local to setup an auto job and this has caused my system unable to boot properly.

Solutions

• Remove the SD Card from Raspberry Pi, mount it to your computer
• Look for cmdline.txt, alter the file based on the value in bold
• Original

console=tty1 root=PARTUUID=9f7945f8-02 rootfstype=ext4 elevator=deadline 
fsck.repair=yes rootwait quiet splash plymouth.ignore-serial-consoles

• Altered

console=tty1 root=/dev/mmcblk0p2 rootfstype=ext4 elevator=deadline 
fsck.repair=yes rootwait quiet splash plymouth.ignore-serial-consoles 
init=/bin/sh

• Insert the SD Card back to the Raspberry Pi board again, reboot the system.
• Run command below to allowed the write access to the SD Card

mount -o remount, rw /

• I reset my "pi" account password 

sudo passwd pi

• Remove the SD Card again from Raspberry Pi, mount it to computer.
• Revert to the original command in cmdline.txt
• Insert the SD Card back to the Raspberry Pi board again, reboot the system