I would categorize this one as an OTA issue.
You could try to dump the signed dtb file by using below command.
./tegraflash.py --bl nvtboot_recovery_cpu.bin --chip 0x18 --applet mb1_recovery_prod.bin --cfg flash.xml --sdram_ config P3310_A00_8GB_Samsung_8GB_lpddr4_204Mhz_A02_l4t.cfg --sdram_config P3310_A00_8GB_Samsung_8GB_lpddr4_204Mhz_A0 2_l4t.cfg --misc_config tegra186-mb1-bct-misc-si-l4t.cfg --pinmux_config tegra186-mb1-bct-pinmux-quill-p3310-1000-c0 3.cfg --pmic_config tegra186-mb1-bct-pmic-quill-p3310-1000-c03.cfg --pmc_config tegra186-mb1-bct-pad-quill-p3310-100 0-c03.cfg --prod_config tegra186-mb1-bct-prod-quill-p3310-1000-c03.cfg --scr_config minimal_scr.cfg --scr_cold_boot_ config mobile_scr.cfg --br_cmd_config tegra186-mb1-bct-bootrom-quill-p3310-1000-c03.cfg --dev_params emmc.cfg --cfg flash.xml --bins "mb2_bootloader nvtboot_recovery.bin; mts_preboot preboot_d15_prod_cr.bin; mts_bootpack mce_mts_d 15_prod_cr.bin; bpmp_fw bpmp.bin; bpmp_fw_dtb tegra186-a02-bpmp-quill-p3310-1000-c01-00-te770d-ucm2.dtb; tlk tos.img ; eks eks.img; bootloader_dtb tegra186-quill-p3310-1000-c03-00-base.dtb" --cmd "sign;
The whole steps would be like:
- build the DTB
- replace new DTB files with $OUT/bootloader/tegra186.dtb
- generate signed files with tegraflash.py
- copy the signed DTB to target device.
- replace the kernel-dtb partition (/dev/mmcblk0p26) with dd command.