It seems like it failed to copy & paste the whole messages.
Here is the output from SDK Manager in the beginning of the flash process:
16:54:44 DEBUG: Flash Jetson Nano - flash: using adapter to install NV_L4T_FLASH_NANO_WITH_OS_IMAGE_COMP@JETSON_NANO_TARGETS to /home/boyoon/nvidia/nvidia_sdk/JetPack_4.6_Linux_JETSON_NANO_TARGETS
16:54:44 INFO: Flash Jetson Nano - flash: current working directory is /home/boyoon/nvidia/nvidia_sdk/JetPack_4.6_Linux_JETSON_NANO_TARGETS/Linux_for_Tegra
16:54:44 INFO: Flash Jetson Nano - flash: exec_command: /tmp/tmp_NV_L4T_FLASH_NANO_WITH_OS_IMAGE_COMP.sh
16:54:44 INFO: Flash Jetson Nano - flash: *** Checking ONLINE mode … OK.
16:54:44 INFO: Flash Jetson Nano - flash: *** Checking target board connection … 1 connections found.
16:54:44 INFO: Flash Jetson Nano - flash: *** Reading ECID … FUSELEVEL=fuselevel_production hwchipid=0x21 bootauth=
16:54:44 INFO: Flash Jetson Nano - flash: *** Reading EEPROM … “/home/boyoon/nvidia/nvidia_sdk/JetPack_4.6_Linux_JETSON_NANO_TARGETS/Linux_for_Tegra/bootloader/tegraflash.py” --chip 0x21 --applet “/home/boyoon/nvidia/nvidia_sdk/JetPack_4.6_Linux_JETSON_NANO_TARGETS/Linux_for_Tegra/bootloader/nvtboot_recovery.bin” --skipuid --cmd “dump eeprom boardinfo cvm.bin; dump eeprom baseinfo bbd.bin”
16:54:44 INFO: Flash Jetson Nano - flash: [ 0.0042 ] tegrarcm --listrcm rcm_list.xml --chip 0x21 0 --download rcm /home/boyoon/nvidia/nvidia_sdk/JetPack_4.6_Linux_JETSON_NANO_TARGETS/Linux_for_Tegra/bootloader/nvtboot_recovery.bin 0 0
16:54:44 INFO: Flash Jetson Nano - flash: [ 0.0095 ] Assuming zero filled SBK key
16:54:44 INFO: Flash Jetson Nano - flash: [ 0.0438 ] tegrarcm --chip 0x21 0 --updatesig rcm_list_signed.xml
16:54:44 INFO: Flash Jetson Nano - flash: [ 0.0983 ] RCM version 0X210001
16:54:45 INFO: Flash Jetson Nano - flash: [ 1.1565 ] Applet version 00.01.0000
16:54:45 INFO: Flash Jetson Nano - flash: [ 1.1589 ] Saved platform info in /home/boyoon/nvidia/nvidia_sdk/JetPack_4.6_Linux_JETSON_NANO_TARGETS/Linux_for_Tegra/bootloader/cvm.bin
16:54:45 INFO: Flash Jetson Nano - flash: [ 1.2390 ] Applet version 00.01.0000
16:54:48 INFO: Flash Jetson Nano - flash: [ 3.2461 ] tegrarcm --listrcm rcm_list.xml --chip 0x21 0 --download rcm /home/boyoon/nvidia/nvidia_sdk/JetPack_4.6_Linux_JETSON_NANO_TARGETS/Linux_for_Tegra/bootloader/nvtboot_recovery.bin 0 0
16:54:48 INFO: Flash Jetson Nano - flash: [ 3.2475 ] RCM 0 is saved as rcm_0.rcm
16:54:48 INFO: Flash Jetson Nano - flash: [ 3.5759 ] RCM 1 is saved as rcm_1.rcm
16:54:49 INFO: Flash Jetson Nano - flash: [ 4.8445 ] tegrasign --key None --list rcm_list.xml --pubkeyhash pub_key.key
16:54:49 INFO: Flash Jetson Nano - flash: [ 4.8458 ] Assuming zero filled SBK key
16:54:49 INFO: Flash Jetson Nano - flash: [ 5.1720 ] tegrarcm --chip 0x21 0 --updatesig rcm_list_signed.xml
16:54:50 INFO: Flash Jetson Nano - flash: [ 5.3141 ] tegrarcm --chip 0x21 0 --rcm rcm_list_signed.xml
16:54:50 INFO: Flash Jetson Nano - flash: [ 5.4138 ] RCM version 0X210001
16:54:51 INFO: Flash Jetson Nano - flash: [ 6.4401 ] tegrarcm --oem platformdetails eeprom /home/boyoon/nvidia/nvidia_sdk/JetPack_4.6_Linux_JETSON_NANO_TARGETS/Linux_for_Tegra/bootloader/bbd.bin
16:54:51 INFO: Flash Jetson Nano - flash: [ 6.4416 ] Applet version 00.01.0000
16:54:51 INFO: Flash Jetson Nano - flash: [ 6.5233 ] Applet version 00.01.0000
16:54:53 INFO: Flash Jetson Nano - flash: [ 6.5257 ]
16:54:53 INFO: Flash Jetson Nano - flash: ###############################################################################
16:54:53 INFO: Flash Jetson Nano - flash: ./tegraflash.py --chip 0x21 --applet “/home/boyoon/nvidia/nvidia_sdk/JetPack_4.6_Linux_JETSON_NANO_TARGETS/Linux_for_Tegra/bootloader/nvtboot_recovery.bin” --skipuid --cmd “dump eeprom boardinfo cvm.bin”
16:54:53 INFO: Flash Jetson Nano - flash: [ 0.0087 ] Assuming zero filled SBK key
16:54:53 INFO: Flash Jetson Nano - flash: [ 0.0526 ] RCM version 0X210001
16:54:54 INFO: Flash Jetson Nano - flash: [ 1.1078 ] tegrarcm --oem platformdetails eeprom /home/boyoon/nvidia/nvidia_sdk/JetPack_4.6_Linux_JETSON_NANO_TARGETS/Linux_for_Tegra/bootloader/cvm.bin
16:54:54 INFO: Flash Jetson Nano - flash: [ 1.1093 ] Applet version 00.01.0000
16:54:54 INFO: Flash Jetson Nano - flash: [ 1.1976 ] Applet version 00.01.0000
16:54:56 INFO: Flash Jetson Nano - flash: [ 1.2001 ]
16:54:56 ERROR: Flash Jetson Nano - flash: Board ID(3448) version(400)
16:54:56 INFO: Flash Jetson Nano - flash: copying bootloader(/home/boyoon/nvidia/nvidia_sdk/JetPack_4.6_Linux_JETSON_NANO_TARGETS/Linux_for_Tegra/bootloader/t210ref/cboot.bin)… done.
16:55:00 INFO: Flash Jetson Nano - flash: copying initrd(/home/boyoon/nvidia/nvidia_sdk/JetPack_4.6_Linux_JETSON_NANO_TARGETS/Linux_for_Tegra/bootloader/l4t_initrd.img)… done.
16:55:02 INFO: Flash Jetson Nano - flash: Making Boot image… done.
16:55:02 INFO: Flash Jetson Nano - flash: copying tegraboot(/home/boyoon/nvidia/nvidia_sdk/JetPack_4.6_Linux_JETSON_NANO_TARGETS/Linux_for_Tegra/bootloader/t210ref/nvtboot.bin)… done.
16:55:02 INFO: Flash Jetson Nano - flash: copying bpffile(/home/boyoon/nvidia/nvidia_sdk/JetPack_4.6_Linux_JETSON_NANO_TARGETS/Linux_for_Tegra/bootloader/t210ref/sc7entry-firmware.bin)… done.
16:55:02 INFO: Flash Jetson Nano - flash: Copying nv_boot_control.conf to rootfs
16:55:05 INFO: Flash Jetson Nano - flash: populating kernel to rootfs… done.
16:55:06 INFO: Flash Jetson Nano - flash: populating initrd to rootfs… done.
16:55:06 INFO: Flash Jetson Nano - flash: Making system.img…