Error might be timeout in USB write

asw@asw-HP-Notebook:~/NV_sources_JP5.1.0/Linux_for_Tegra$ sudo ./tools/kernel_flash/l4t_initrd_flash.sh \

–external-device nvme0n1
-c tools/kernel_flash/flash_l4t_external.xml
-S 64GiB
–showlogs
–network usb0
–usb-instance 2-1
p3509-a02+p3767-0000 nvme0n1p1

my issue are-

[ 10.4976 ] Using ramcode 0
[ 10.4976 ] Disabled BPMP dtb trim, using default dtb
[ 10.4976 ]
[ 10.5002 ] tegrahost_v2 --chip 0x23 0 --align mem_rcm_aligned.bct
[ 10.5058 ] tegrahost_v2 --chip 0x23 0 --magicid MEM0 --ratchet_blob ratchet_blob.bin --appendsigheader mem_rcm_aligned.bct zerosbk
[ 10.5078 ] adding BCH for mem_rcm_aligned.bct
[ 10.6425 ] tegrasign_v3.py --key None --list mem_rcm_aligned_sigheader.bct_list.xml --pubkeyhash pub_key.key --sha sha512
[ 10.6429 ] Assuming zero filled SBK key
[ 10.6468 ] Warning: pub_key.key is not found
[ 10.5193 ] tegrahost_v2 --chip 0x23 0 --updatesigheader mem_rcm_aligned_sigheader.bct.encrypt mem_rcm_aligned_sigheader.bct.hash zerosbk
[ 10.5230 ] Copying signatures
[ 10.5265 ] tegrahost_v2 --chip 0x23 0 --partitionlayout flash.xml.bin --updatesig images_list_signed.xml
[ 10.5329 ] tegraparser_v2 --generategpt --pt flash.xml.bin
[ 10.5360 ] End sector for APP, expected at: 119537630, actual: 0
Error: Return value 4
Command tegraparser_v2 --generategpt --pt flash.xml.bin
Error: /home/asw/NV_sources_JP5.1.0/Linux_for_Tegra/bootloader/signed/flash.idx is not found
Error: failed to relocate images to /home/asw/NV_sources_JP5.1.0/Linux_for_Tegra/tools/kernel_flash/images
Cleaning up…

Jetpack5.1 is quite old please move to latest release.