Equivalent script

[expelledboy]

#!/usr/bin/env bash

export PATH=$PATH:$ANDROID_HOME/platform-tools

PKG_NAME=com.whatsapp
LEGACY_APK_FILE=WhatsApp.legacy.apk
BACKUP_APK_FILE=WhatsApp.backup.apk

info() {
	echo "==> [info] $*"
}

error() {
	echo "==> [error] $*"
	exit 1
}

install_apk() {
	local apk_filepath=$1

	if [ "$SDK_VERSION" -ge 17 ]; then
		adb install -r -d "$apk_filepath"
	else
		adb install -r "$apk_filepath"
	fi
}

uninstall_package() {
	local package=$1

	if [ "$SDK_VERSION" -ge 23 ]; then
		adb shell pm uninstall -k "$package"
	fi
}

stop_package() {
	local package=$1

	if [ "$SDK_VERSION" -ge 11 ]; then
		adb shell am force-stop "$package"
	else
		adb shell am kill "$package"
	fi

}

backup_package() {
	local package=$1

	if [ "$SDK_VERSION" -ge 23 ]; then
		adb backup -f whatsapp.ab "$package"
	else
		adb backup -f whatsapp.ab -noapk "$package"
	fi
}

cleanup() {
	if [ -f "$BACKUP_APK_FILE" ]; then
		install_apk "$BACKUP_APK_FILE"
	fi

	adb kill-server
}

trap cleanup EXIT

set -eu -o pipefail

info "Check for required binaries"

for cmd in adb curl grep java tar tr; do
	command -v $cmd || error "$cmd not available"
done

info "Please connect your Android device with USB Debugging enabled"

adb kill-server
adb start-server
adb wait-for-device

info "Checking script compatibility"

SDK_VERSION=$(adb shell getprop ro.build.version.sdk | tr -d '[:space:]')

if [ "$SDK_VERSION" -le 13 ]; then
	error "Unsupported Android Version - Require 4.0 or higher"
fi

APK_VERSION=$(adb shell dumpsys package com.whatsapp | sed -nE 's/.*versionName=(.*)/\1/p' || true)

if [ -z "$APK_VERSION" ]; then
	error "WhatsApp not installed on device"
fi

APK_PATH=$(adb shell pm path com.whatsapp | sed -nE 's/.*package:(.*)/\1/p')
BACKUP_DIR=$(adb shell "echo -e \$EXTERNAL_STORAGE/WhatsApp/Databases/.nomedia")

if [ ! -f $LEGACY_APK_FILE ]; then
	info "Downloading legacy WhatsApp version"
	curl -o $LEGACY_APK_FILE https://whatcrypt.com/WhatsApp-2.11.431.apk
fi

if [ "$(wc -c <$LEGACY_APK_FILE)" -lt 10000 ]; then
	error "Failed to download legacy WhatsApp apk"
fi

info "Running with configuration"

echo "APK_VERSION = '$APK_VERSION'"
echo "APK_PATH = '$APK_PATH'"
echo "BACKUP_DIR = '$BACKUP_DIR'"

info "Replacing WhatsApp ${APK_VERSION} with Legacy build"

if [ ! -f $BACKUP_APK_FILE ]; then
	info "Downloading installed WhatsApp version"
	adb pull "$APK_PATH" "$BACKUP_APK_FILE"
fi

stop_package $PKG_NAME
uninstall_package "$PKG_NAME"
install_apk $LEGACY_APK_FILE

info "Attempting backup using legacy whatsapp"

backup_package "$PKG_NAME"

info "Restoring WhatsApp"

cleanup

[SenCodeMaker]

thank you this helped me to install whatapps mod and get non encrypted backup