A script that fetches a ChromeOS image for ARM64 and extracts the Widevine and Flash

widevine-flash_arm64.sh

#!/bin/sh -eu

# Make sure we have wget or curl
available () {
  command -v "$1" >/dev/null 2>&1
}
if available wget; then
  DL="wget -O-"
  DL_SL="wget -qO-"
elif available curl; then
  DL="curl -L"
  DL_SL="curl -s"
else
  echo "Install Wget or cURL" >&2
  exit 1
fi

# Find a URL to a suitable armhf ChromeOS recovery image
CHROMEOS_URL="$($DL_SL https://dl.google.com/dl/edgedl/chromeos/recovery/recovery.conf | grep -A11 C101PA | sed -n 's/^url=//p')"
CHROMEOS_IMG="$(basename "$CHROMEOS_URL" .zip)"
if [ -e "$CHROMEOS_IMG" ]; then
  CHROMEOS_IMG_PATH="./"
  DEL_IMG=N
else
  CHROMEOS_IMG_PATH="$(mktemp -d ChromeOS-IMG.XXXXXX)"
  DEL_IMG=Y
  # Fetch the recovery image (2Gb+ on disk after download)
  $DL "$CHROMEOS_URL" | zcat > "$CHROMEOS_IMG_PATH/$CHROMEOS_IMG"
fi

# Note the next free loop device in a variable
LOOPD="$(losetup -f)"

# If root, we can mount silently (no popup windows after mount)
if [ "$USER" = "root" ]; then
  MNTPNT="$(mktemp -d ChromeOS.XXXXXX)"
  losetup -Pf "$CHROMEOS_IMG_PATH/$CHROMEOS_IMG"
  mount -o ro "${LOOPD}p3" "$MNTPNT"
else
  # Associate all the partitions on the disk image with loop devices:
  udisksctl loop-setup -rf "$CHROMEOS_IMG_PATH/$CHROMEOS_IMG"
  sleep 1
  # Mount the third partition of the disk image (if the previous did not do it automatically)
  if ! lsblk -lo MOUNTPOINT "${LOOPD}p3" | tail -n1 | grep -q \.; then
    udisksctl mount -b "${LOOPD}p3"
  fi
  # Note the mount point in a variable
  MNTPNT="$(lsblk -lo MOUNTPOINT "${LOOPD}p3" | tail -n1)"
fi

# Copy over files and make manifest
CHRFILES="$(mktemp -d ChromeOS_Files.XXXXXX)"
install -Dm644 "$MNTPNT"/opt/google/chrome/pepper/libpepflashplayer.so "$CHRFILES"/opt/google/chrome/PepperFlash/libpepflashplayer.so
install -Dm644 "$MNTPNT"/opt/google/chrome/libwidevinecdm.so "$CHRFILES"/opt/WidevineCdm/_platform_specific/linux_arm/libwidevinecdm.so
WVVER="$(grep -Eaom1 '([0-9]+\.){3}[0-9]+' "$CHRFILES"/opt/WidevineCdm/_platform_specific/linux_arm/libwidevinecdm.so)"
WVMGR="$(echo $WVVER | cut -d. -f1)"
WVMIN="$(echo $WVVER | cut -d. -f2)"
echo "{\"version\":\"$WVVER\",\"x-cdm-codecs\":\"vp8,vp9.0,avc1,av01\",\"x-cdm-host-versions\":\"$WVMIN\",\"x-cdm-interface-versions\":\"$WVMIN\",\"x-cdm-module-versions\":\"$WVMGR\"}" > "$CHRFILES"/opt/WidevineCdm/manifest.json

# Extract the libs out and copy them to a compressed tar archive
ARCHIVE_NAME="widevine-flash-$(date '+%Y%m%d')_armhf.tgz"
echo "Extracting and compressing files"
tar -C"$CHRFILES" -caf "$ARCHIVE_NAME" opt/WidevineCdm/manifest.json opt/WidevineCdm/_platform_specific/linux_arm/libwidevinecdm.so opt/google/chrome/PepperFlash/libpepflashplayer.so --format ustar --owner 0 --group 0
rm -r "$CHRFILES"
echo "Created: $ARCHIVE_NAME"

# Cleanup
if [ "$USER" = "root" ]; then
  umount "$MNTPNT"
  losetup -d "$LOOPD"
  rmdir "$MNTPNT"
else
  ALLMNTS="$(lsblk -lo NAME,MOUNTPOINT "$LOOPD" | sed -n '/\//s/^\(loop[0-9]\+p[0-9]\+\).*/\1/p')"
  echo "$ALLMNTS" | xargs -I{} -n1 udisksctl unmount -b /dev/{}
  if [ "$LOOPD" != "$(losetup -f)" ]; then
    udisksctl loop-delete -b "$LOOPD"
  fi
fi
if [ "$DEL_IMG" = "N" ] || [ "${1:-EMPTY}" = "-k" ]; then
  :
else
  rm "$CHROMEOS_IMG_PATH/$CHROMEOS_IMG"
  rmdir -v "$CHROMEOS_IMG_PATH"
fi

# Inform the user how to proceed
cat <<EOF

To install the contents of these files on an ARMhf device, copy the tar archive over to the target machine and issue the following:

  sudo tar Cfx / $ARCHIVE_NAME

After install of these libraries, issue the following two commands and restart Vivaldi:

  mkdir -p ~/.config/vivaldi/WidevineCdm
  echo '{"Path":"/opt/WidevineCdm"}' > ~/.config/vivaldi/WidevineCdm/latest-component-updated-widevine-cdm

EOF

This is 32bit binary there is no arm64 version.
Quite misleading as I tried it already

This script is based on C101PA (Asus Chromebook Flip C101PA - ARMv8 Cortex-A72 - 64bit), I don't have clue why they use a 32bit file in a 64bit Chrome OS ...
I am still looking for a solution!

They never released any 64bit version of ChromeOS.

They only have 64bit kernel with 32bit userspace.
The hardware is 64bit and can support 32 and 64bit userspace.
Good luck.