J4012 Flash Problem

J4012 Orin NX 16GB Fash

i cant get passed the following problem when following the flash guide step 4 (reComputer J30 Series, J40 Series | J401 | Seeed Studio Wiki)

Making Boot image… done.
Not signing of boot.img
Making recovery ramdisk for recovery image…
Re-generating recovery ramdisk for recovery image…
/home/anton/Downloads/Linux_for_Tegra/bootloader/ramdisk_tmp /home/anton/Downloads/Linux_for_Tegra/bootloader /home/anton/Downloads/Linux_for_Tegra
39726 blocks

gzip: /home/anton/Downloads/Linux_for_Tegra/kernel/Image: not in gzip format
/home/anton/Downloads/Linux_for_Tegra/tools/ota_tools/version_upgrade/ota_make_recovery_img_dtb.sh: line 177: strings: command not found
ERROR: failed to get kernel version from /home/anton/Downloads/Linux_for_Tegra/kernel/Image
Error: failed to generate images
Cleaning up…

Hello, what version of jetpack are you flashing? Please note that for jetpack 5.1.2 you need to apply additional patches