TX2 4GB som board flashing issue

I am trying to flash TX2 4Gb module on my customize hardware.
it is getting failed with error

[ 7.3762 ] tegrarcm_v2 --isapplet
[ 7.3789 ] Applet version 01.00.0000
[ 7.3929 ]
[ 7.3929 ] Sending BCTs
[ 7.3936 ] tegrarcm_v2 --download bct_bootrom br_bct_BR.bct --download bct_mb1 mb1_bct_MB1_sigheader.bct.encrypt
[ 7.3942 ] Applet version 01.00.0000
[ 7.4171 ] Sending bct_bootrom
[ 7.4172 ] […] 100%
[ 7.4185 ] Sending bct_mb1
[ 7.4196 ] […] 100%
[ 7.4262 ]
Error: Return value 8
Command tegrarcm_v2 --download bct_bootrom br_bct_BR.bct --download bct_mb1 mb1_bct_MB1_sigheader.bct.encrypt
Failed flashing t186ref.

so this flashing is failing at micro bootrom end(MB1) what i see in boot flow diagram,what i see in the document is that cboot is used for flashing but it is failing before that at MB1 end,is it happening because of validating BCT or what,how to debug it or it may be some hardware pin issue with my customize board.

Any help will be appreciated.

hello anupam.kumar,

you may refer to TX2 Product Design Guide for the documentation of your board customization.
you should also check MB1 Configuration Changes to apply board configurations, such as Pinmux, GPIO, and PMIC changes.
thanks