MicroSD card is needed to image the file, change `5.10.82-v8-ext4-2021-12-05` and `mmcblk1` to whatever you have, use `ls` and `lsblk` to check it.
MicroSD card is needed to image the file, change `5.10.82-v8-ext4-2021-12-05` and `mmcblk1` to whatever you have, use `ls` and `lsblk` to check it. Unmount SD card and if it has more than one partition, you will need to unmount each partition.
* *Substitute the microSD for a real USB hard drive as the Raspberry Pi 4 8GB model supports booting directly off USB. If you're using a Pine64 Rock64 board, then it gets more complicated and requires you to flash some new firmware to enable USB boot.*