Can't re-flash my chromebook using SuzyQable

I’ve built my own SuzyQable after bricking my Thinkpad C13 Chromebook and have tried following the unbricking guide here Unbricking/Flashing with a Suzy-Q cable | Chrultrabook Docs. Sadly when I try to run

chromebook_recovery]$ sudo flashrom -p raiden_debug_spi:target=ap -r badflash.rom

to extract the bad flash I get the following Error:

Raiden: Read response failed
    protocol       = 1
    write count    = 1
    read count     = 3
    received bytes = 0
    write attempt  = 1
    read attempt   = 1
    status         = 0x00005
Raiden: Read response failed
    protocol       = 1
    write count    = 4
    read count     = 2
    received bytes = 0
    write attempt  = 1
    read attempt   = 1
    status         = 0x00005
No EEPROM/flash device found.

The raiden read response failed is spammed like a thousand times.

I have already done echo "ccd open" | sudo tee -a /dev/ttyUSB0 > /dev/null to all available ttyUSB devices and have confirmed the chromebook shows up in lsusb:

Bus 001 Device 048: ID 18d1:5014 Google Inc. Cr50

I have opened up the chromebook and unplugged the battery. Please help me debug this

Okay I managed to fix it by running screen /dev/ttyUSB3 (device may be different for you) and then typing ccd open in the screen window