Presuming all units are running Jetpack BASE_REL=5.1.2/r35.4.1.
Have you tried a 5.1.2/r35.4.1 bootloader only update on the units that have “Current version: 0.0.1” ?
And if that succeessfully updates to “Current version: 35.4.1” then run OTA_update to $TARGET_REL?
Presuming all units are running Jetpack BASE_REL=5.1.2/r35.4.1
sudo apt --reinstall install nvidia-l4t-bootloader
#to look at contents of the bootloader*.deb.s of the bootloader*.deb.
wget https://repo.download.nvidia.com/jetson/t194/pool/main/n/nvidia-l4t-bootloader/nvidia-l4t-bootloader_35.4.1-20230801124926_arm64.deb
dpkg-deb -X nvidia-l4t-bootloader_35.4.1-20230801124926_arm64.deb .
for HOST in "${HOSTS[@]}"; do
echo "[$HOST] checking bootloader version …"
CURRENT_VER=$(ssh -o BatchMode=yes "${USER}@${HOST}" \
"sudo nvbootctrl dump-slots-info | awk '/^Current version:/ {print $3}'")
echo " current version = $CURRENT_VER"
if [[ "$CURRENT_VER" == "0.0.1" ]]; then
sudo DEBIAN_FRONTEND=noninteractive apt --reinstall install nvidia-l4t-bootloader