Same error with jetpack 4.4.1
[ 10.9452 ] tegradevflash_v2 --pt flash.xml.bin --create
[ 10.9462 ] Bootloader version 01.00.0000
[ 10.9661 ] Erasing sdmmc_boot: 3 … [Done]
[ 12.0612 ] Writing partition secondary_gpt with gpt_secondary_0_3.bin
[ 12.0625 ] […] 100%
[ 12.1746 ] Erasing sdmmc_user: 3 … [Done]
[ 12.6674 ] Writing partition master_boot_record with mbr_1_3.bin
[ 12.6687 ] […] 100%
[ 12.6702 ] Writing partition primary_gpt with gpt_primary_1_3.bin
[ 12.6762 ] […] 100%
[ 12.6774 ] 000000000d0d0001: o initialize partition table from GPT.
[ 12.6907 ]
[ 12.6908 ]
Error: Return value 1
Command tegradevflash_v2 --pt flash.xml.bin --create
Failed flashing t186ref.