i am able to pass the test on my terra with v4.

this is the snippet where it passes
10/20 15:27:26.688 INFO |     firmware_test:0488| Changing GBB flags from 0x140 to 0x1140.
10/20 15:27:40.366 INFO |     mode_switcher:0289| -[ModeSwitcher]-[ start mode_aware_reboot(None, warm_reset, ..) ]-
10/20 15:27:40.407 INFO |     firmware_test:1141| boot_id: e056e43c-5ba5-4706-b20f-cd4a4ba6a5df
10/20 15:27:40.690 INFO |     mode_switcher:0298| -[mode_aware_reboot]-[ is_normal=False is_dev=False ]-
10/20 15:27:40.690 INFO |             servo:0530| Set/get all: ['warm_reset:on', 'sleep:0.5000', 'warm_reset:off']
10/20 15:27:42.220 INFO |     mode_switcher:0315| -[ModeSwitcher]-[ end mode_aware_reboot(None, warm_reset, ..) ]-
10/20 15:28:07.246 INFO |             servo:0512| Setting lid_open to no
10/20 15:28:09.260 INFO |     firmware_test:0735| Checking power state "S0" maximum 13 times.
10/20 15:28:09.261 INFO |     firmware_test:0737| try count: 13
10/20 15:28:09.261 INFO |             servo:0512| Setting ec_uart_regexp to ['S0']
10/20 15:28:09.264 INFO |             servo:0512| Setting ec_uart_cmd to powerinfo
10/20 15:28:09.297 INFO |             servo:0512| Setting lid_open to yes
10/20 15:28:40.348 INFO |     mode_switcher:0289| -[ModeSwitcher]-[ start mode_aware_reboot('cold', reset, ..) ]-
10/20 15:28:40.348 INFO |     mode_switcher:0298| -[mode_aware_reboot]-[ is_normal=False is_dev=False ]-
10/20 15:28:40.348 INFO |             servo:0512| Setting power_state to reset

ah, maybe this is specific to orco then? This test failed twice on 2 different duts the same way.

Test pass on my orco
/tmp/test_that_results_G8k60E/results-1-firmware_ECUsbPorts                     [  PASSED  ]
/tmp/test_that_results_G8k60E/results-1-firmware_ECUsbPorts/firmware_ECUsbPorts [  PASSED  ]


Here's the detail on the DUT
Type of hardware  : orco PVT QV4
Chrome OS Version : 7657.0.0 (Official Build) dev-channel orco test
BIOS VERSION      : Google_Orco.5216.362.7 / Google_Orco.5216.362.7
EC Version        : orco_v1.6.253-6cc0ece / orco_v1.6.253-6cc0ece
PD Version        : N/A

CPU arch     : x86_64
CPU model    : Intel(R) Celeron(R) CPU N2840 @ 2.16GHz
CPU speed    : 2582.3000
Total Memory : 1966808 kB
Memory Type  : 1-78: Samsung | 00000000 | M471B5674QH0-YK0
MMC Model    : AGND3R
MMC Firmware : 0x0100000000000000

VPD info:
  mlb_serial_number=QT10JH52800022
  initial_locale=en-GB
  initial_timezone=Europe/London
  keyboard_layout=xkb:gb:extd:eng
  region=gb
  rlz_brand_code=LEAG
  serial_number=LR041RHJ

Bulk closing Infra>Client>ChromeOS issues untouched in over a year.