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How To Fix "Stock Backup Does Not Exist" message in Magisk when using "Restore Images" to flash OTA

DISCLAIMER: I didn't come up with these steps, nor do I provide any support for these steps. I just wanted to add some additional information that helped me. Not responsible if you brick your phone/cause thermonuclear war/etc. Use at your own risk/PLEASE google/research if you are unsure of what you're doing.

STEP 1:

Connect your phone to your computer via ADB. If you don't know how to do this, please search before following these steps

STEP 2:

put stock boot.img into /sdcard/boot.img. MAKE SURE the name of the file is "boot.img", otherwise you will need to alter the following commands to use the name of the file. MAKE SURE your stock boot.img IS A VALID BOOT FILE, if it is not, Magisk will still restore the image, but the OTA will not work and your phone will not work upon reboot.

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package com.scottyab.whatsnewplayground.data

import android.content.Context
import android.content.SharedPreferences
import androidx.security.crypto.EncryptedSharedPreferences
import androidx.security.crypto.MasterKeys
import com.scottyab.whatsnewplayground.BuildConfig

internal class SampleEncPrefs(context: Context) {

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import android.content.Context;
import android.content.pm.PackageInfo;
import android.content.pm.PackageManager;
import android.content.pm.PackageManager.NameNotFoundException;
import android.content.pm.Signature;

public class TamperCheck {

//we store the hash of the signture for a little more protection
private static final String APP_SIGNATURE = "1038C0E34658923C4192E61B16846";

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// package me.piebridge;

import java.io.IOException;
import java.io.RandomAccessFile;
import java.math.BigInteger;
import java.nio.ByteBuffer;
import java.nio.ByteOrder;
import java.util.Arrays;
import java.util.regex.Matcher;
import java.util.regex.Pattern;

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import android.app.AppComponentFactory;
import android.content.pm.ApplicationInfo;
import android.util.Log;

import java.io.IOException;
import java.nio.ByteBuffer;
import java.nio.channels.Channels;
import java.util.ArrayList;
import java.util.List;
import java.util.zip.ZipFile;

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jint JNI_OnLoad(JavaVM *jvm, void *) {
    JNIEnv *env;
    jclass clazz;

    if (jvm->GetEnv((void **) &env, JNI_VERSION_1_6) != JNI_OK) {
        return JNI_ERR;
    }

    jclass vm = env->FindClass("dalvik/system/VMRuntime");
    jclass string = env->FindClass("java/lang/String");

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#include <unistd.h>
#include <string>
#include <cinttypes>
#include <android/log.h>
#include <sys/system_properties.h>

using namespace std;

extern "C" {

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.segment "HEADER"
  .byte "NES", $1A ; Constant
  .byte 2 ; 2 x 16KB PRG ROM
  .byte 1 ; 1 x 8KB CHR ROM

.segment "CHARS"
  ;-------------------------------------------------------------
  ; CREATE SPRITES
  ;-------------------------------------------------------------
  ; The following creates one sprite. The following two bitmaps

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;  ___           _        __ ___  __ ___
; / __|_ _  __ _| |_____ / /| __|/  \_  )
; \__ \ ' \/ _` | / / -_) _ \__ \ () / /
; |___/_||_\__,_|_\_\___\___/___/\__/___|

; An annotated version of the snake example from Nick Morgan's 6502 assembly tutorial
; on http://skilldrick.github.io/easy6502/ that I created as an exercise for myself
; to learn a little bit about assembly. I **think** I understood everything, but I may
; also be completely wrong :-)

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/**
 * Educational "Free-list" memory allocator.
 *
 * Maintains explicit list of free memory blocks, reuses blocks on free.
 * Implements "first-fit" strategy. Uses pre-allocated heap of 64 bytes,
 * with 32-bit machine word size.
 *
 * TODO:
 *
 *   - Implement "best-fit" strategy