Oneplus Nord CE 5 root

https://xdaforums.com/t/stockrom-oneplus-nord-5-stock-firmware-boot-img-for-rooting-request-for-custom-recovery.4757591/

# boot into normal
fastboot reboot

# boot to bootloader
adb reboot bootloader

$ fastboot flash recovery ..\twrp-3.7.1_12-0-avicii.img
Warning: skip copying recovery image avb footer (recovery partition size: 0, recovery image size: 47124480).
Sending ‘recovery’ (46020 KB) OKAY [ 1.135s]
Writing ‘recovery’ FAILED (remote: ‘partition does not exist’)
fastboot: error: Command failed

fastboot boot ..\twrp-3.7.1_12-0-avicii.img
Sending ‘boot.img’ (46020 KB) OKAY [ 1.146s]
Booting FAILED (remote: ‘unknown command’)

fastboot: error: Command failed

remote: ‘partition does not exist’

Install LineageOS on OnePlus 12R

fastboot flash boot ..\boot.img
Sending sparse ‘boot_a’ 1/1 (45860 KB) OKAY [ 1.144s]
Writing ‘boot_a’ FAILED (remote: ‘sparse image size span overflow.’)
fastboot: error: Command failed