diff --git a/app/src/main/assets/updateLog.md b/app/src/main/assets/updateLog.md
index 548acdae2..6f89963a0 100644
--- a/app/src/main/assets/updateLog.md
+++ b/app/src/main/assets/updateLog.md
@@ -11,7 +11,7 @@
 * 正文出现缺字漏字、内容缺失、排版错乱等情况，有可能是净化规则或简繁转换出现问题。
 * 漫画源看书显示乱码，**阅读与其他软件的源并不通用**，请导入阅读的支持的漫画源！
 
-**2022/09/19**
+**2022/09/20**
 
 * 发现为空时不校验
 * 订阅添加刷新分类功能,菜单中
diff --git a/app/src/main/java/io/legado/app/help/AppUpdate.kt b/app/src/main/java/io/legado/app/help/AppUpdate.kt
index cb21c55e9..805036363 100644
--- a/app/src/main/java/io/legado/app/help/AppUpdate.kt
+++ b/app/src/main/java/io/legado/app/help/AppUpdate.kt
@@ -8,7 +8,6 @@ import io.legado.app.help.http.newCallStrResponse
 import io.legado.app.help.http.okHttpClient
 import io.legado.app.utils.jsonPath
 import io.legado.app.utils.readString
-import io.legado.app.utils.toastOnUi
 import kotlinx.coroutines.CoroutineScope
 import splitties.init.appCtx
 
@@ -16,10 +15,8 @@ object AppUpdate {
 
     fun checkFromGitHub(
         scope: CoroutineScope,
-        showErrorMsg: Boolean = true,
-        callback: (newVersion: String, updateBody: String, url: String, fileName: String) -> Unit
-    ) {
-        Coroutine.async(scope) {
+    ): Coroutine<UpdateInfo> {
+        return Coroutine.async(scope) {
             val lastReleaseUrl = appCtx.getString(R.string.latest_release_api)
             val body = okHttpClient.newCallStrResponse {
                 url(lastReleaseUrl)
@@ -37,18 +34,18 @@ object AppUpdate {
                     ?: throw NoStackTraceException("获取新版本出错")
                 val fileName = rootDoc.readString("$.assets[0].name")
                     ?: throw NoStackTraceException("获取新版本出错")
-                return@async arrayOf(tagName, updateBody, downloadUrl, fileName)
+                return@async UpdateInfo(tagName, updateBody, downloadUrl, fileName)
             } else {
                 throw NoStackTraceException("已是最新版本")
             }
         }.timeout(10000)
-            .onSuccess {
-                callback.invoke(it[0], it[1], it[2], it[3])
-            }.onError {
-                if (showErrorMsg) {
-                    appCtx.toastOnUi("检测更新\n${it.localizedMessage}")
-                }
-            }
     }
 
+    data class UpdateInfo(
+        val tagName: String,
+        val updateLog: String,
+        val downloadUrl: String,
+        val fileName: String
+    )
+
 }
\ No newline at end of file
diff --git a/app/src/main/java/io/legado/app/help/AppWebDav.kt b/app/src/main/java/io/legado/app/help/AppWebDav.kt
index 2ef0bce5e..58a5e0464 100644
--- a/app/src/main/java/io/legado/app/help/AppWebDav.kt
+++ b/app/src/main/java/io/legado/app/help/AppWebDav.kt
@@ -139,7 +139,6 @@ object AppWebDav {
         authorization?.let {
             val webDav = WebDav(rootWebDavUrl + name, it)
             webDav.downloadTo(zipFilePath, true)
-            @Suppress("BlockingMethodInNonBlockingContext")
             ZipUtils.unzipFile(zipFilePath, Backup.backupPath)
             Restore.restoreDatabase()
             Restore.restoreConfig()
diff --git a/app/src/main/java/io/legado/app/help/BookHelp.kt b/app/src/main/java/io/legado/app/help/BookHelp.kt
index 65250e595..78c440b47 100644
--- a/app/src/main/java/io/legado/app/help/BookHelp.kt
+++ b/app/src/main/java/io/legado/app/help/BookHelp.kt
@@ -311,7 +311,7 @@ object BookHelp {
         newChapterList: List<BookChapter>,
         oldChapterListSize: Int = 0
     ): Int {
-        if (oldDurChapterIndex == 0) return oldDurChapterIndex
+        if (oldDurChapterIndex == 0) return 0
         if (newChapterList.isEmpty()) return oldDurChapterIndex
         val oldChapterNum = getChapterNum(oldDurChapterName)
         val oldName = getPureChapterName(oldDurChapterName)
@@ -358,6 +358,7 @@ object BookHelp {
         Pattern.compile(".*?第([\\d零〇一二两三四五六七八九十百千万壹贰叁肆伍陆柒捌玖拾佰仟]+)[章节篇回集话]")
     }
 
+    @Suppress("RegExpSimplifiable")
     private val chapterNamePattern2 by lazy {
         Pattern.compile("^(?:[\\d零〇一二两三四五六七八九十百千万壹贰叁肆伍陆柒捌玖拾佰仟]+[,:、])*([\\d零〇一二两三四五六七八九十百千万壹贰叁肆伍陆柒捌玖拾佰仟]+)(?:[,:、]|\\.[^\\d])")
     }
@@ -385,7 +386,7 @@ object BookHelp {
         return@lazy "[^\\w\\u4E00-\\u9FEF〇\\u3400-\\u4DBF\\u20000-\\u2A6DF\\u2A700-\\u2EBEF]".toRegex()
     }
 
-    @Suppress("RegExpUnnecessaryNonCapturingGroup")
+    @Suppress("RegExpUnnecessaryNonCapturingGroup", "RegExpSimplifiable")
     private val regexB by lazy {
         //章节序号，排除处于结尾的状况，避免将章节名替换为空字串
         return@lazy "^.*?第(?:[\\d零〇一二两三四五六七八九十百千万壹贰叁肆伍陆柒捌玖拾佰仟]+)[章节篇回集话](?!$)|^(?:[\\d零〇一二两三四五六七八九十百千万壹贰叁肆伍陆柒捌玖拾佰仟]+[,:、])*(?:[\\d零〇一二两三四五六七八九十百千万壹贰叁肆伍陆柒捌玖拾佰仟]+)(?:[,:、](?!$)|\\.(?=[^\\d]))".toRegex()
diff --git a/app/src/main/java/io/legado/app/ui/about/AboutFragment.kt b/app/src/main/java/io/legado/app/ui/about/AboutFragment.kt
index 945ec3ca0..341d611dd 100644
--- a/app/src/main/java/io/legado/app/ui/about/AboutFragment.kt
+++ b/app/src/main/java/io/legado/app/ui/about/AboutFragment.kt
@@ -16,6 +16,7 @@ import io.legado.app.lib.dialogs.alert
 import io.legado.app.lib.dialogs.selector
 import io.legado.app.ui.widget.dialog.TextDialog
 import io.legado.app.utils.*
+import splitties.init.appCtx
 
 class AboutFragment : PreferenceFragmentCompat() {
 
@@ -80,14 +81,23 @@ class AboutFragment : PreferenceFragmentCompat() {
         showDialogFragment(TextDialog(mdText, TextDialog.Mode.MD))
     }
 
+    /**
+     * 检测更新
+     */
     private fun checkUpdate() {
-        AppUpdate.checkFromGitHub(lifecycleScope) { newVersion, updateBody, url, name ->
-            showDialogFragment(
-                UpdateDialog(newVersion, updateBody, url, name)
-            )
-        }
+        AppUpdate.checkFromGitHub(lifecycleScope)
+            .onSuccess {
+                showDialogFragment(
+                    UpdateDialog(it)
+                )
+            }.onError {
+                appCtx.toastOnUi("${getString(R.string.check_update)}\n${it.localizedMessage}")
+            }
     }
 
+    /**
+     * 显示qq群
+     */
     private fun showQqGroups() {
         alert(titleResource = R.string.join_qq_group) {
             val names = arrayListOf<String>()
@@ -104,6 +114,9 @@ class AboutFragment : PreferenceFragmentCompat() {
         }
     }
 
+    /**
+     * 加入qq群
+     */
     private fun joinQQGroup(key: String): Boolean {
         val intent = Intent()
         intent.data =
diff --git a/app/src/main/java/io/legado/app/ui/about/UpdateDialog.kt b/app/src/main/java/io/legado/app/ui/about/UpdateDialog.kt
index 287157c88..33cfb8476 100644
--- a/app/src/main/java/io/legado/app/ui/about/UpdateDialog.kt
+++ b/app/src/main/java/io/legado/app/ui/about/UpdateDialog.kt
@@ -6,6 +6,7 @@ import android.view.ViewGroup
 import io.legado.app.R
 import io.legado.app.base.BaseDialogFragment
 import io.legado.app.databinding.DialogUpdateBinding
+import io.legado.app.help.AppUpdate
 import io.legado.app.help.config.AppConfig
 import io.legado.app.lib.theme.primaryColor
 import io.legado.app.model.Download
@@ -19,12 +20,12 @@ import io.noties.markwon.image.glide.GlideImagesPlugin
 
 class UpdateDialog() : BaseDialogFragment(R.layout.dialog_update) {
 
-    constructor(newVersion: String, updateBody: String, url: String, name: String) : this() {
+    constructor(updateInfo: AppUpdate.UpdateInfo) : this() {
         arguments = Bundle().apply {
-            putString("newVersion", newVersion)
-            putString("updateBody", updateBody)
-            putString("url", url)
-            putString("name", name)
+            putString("newVersion", updateInfo.tagName)
+            putString("updateBody", updateInfo.updateLog)
+            putString("url", updateInfo.downloadUrl)
+            putString("name", updateInfo.fileName)
         }
     }
 
@@ -61,6 +62,7 @@ class UpdateDialog() : BaseDialogFragment(R.layout.dialog_update) {
                         val name = arguments?.getString("name")
                         if (url != null && name != null) {
                             Download.start(requireContext(), url, name)
+                            toastOnUi(R.string.download_start)
                         }
                     }
                 }
diff --git a/app/src/main/java/io/legado/app/ui/book/read/ReadBookActivity.kt b/app/src/main/java/io/legado/app/ui/book/read/ReadBookActivity.kt
index 7b4598ebc..acc6c94f5 100644
--- a/app/src/main/java/io/legado/app/ui/book/read/ReadBookActivity.kt
+++ b/app/src/main/java/io/legado/app/ui/book/read/ReadBookActivity.kt
@@ -779,7 +779,7 @@ class ReadBookActivity : BaseReadBookActivity(),
 
     override fun changeTo(source: BookSource, book: Book, toc: List<BookChapter>) {
         if (book.type != BookType.audio) {
-            viewModel.changeTo(source, book, toc)
+            viewModel.changeTo(book, toc)
         } else {
             ReadAloud.stop(this)
             launch {
diff --git a/app/src/main/java/io/legado/app/ui/book/read/ReadBookViewModel.kt b/app/src/main/java/io/legado/app/ui/book/read/ReadBookViewModel.kt
index f6f2d335c..bfa935cd7 100644
--- a/app/src/main/java/io/legado/app/ui/book/read/ReadBookViewModel.kt
+++ b/app/src/main/java/io/legado/app/ui/book/read/ReadBookViewModel.kt
@@ -14,7 +14,6 @@ import io.legado.app.data.appDb
 import io.legado.app.data.entities.Book
 import io.legado.app.data.entities.BookChapter
 import io.legado.app.data.entities.BookProgress
-import io.legado.app.data.entities.BookSource
 import io.legado.app.exception.NoStackTraceException
 import io.legado.app.help.AppWebDav
 import io.legado.app.help.BookHelp
@@ -93,7 +92,7 @@ class ReadBookViewModel(application: Application) : BaseViewModel(application) {
             if (ReadBook.durChapterIndex > ReadBook.chapterSize - 1) {
                 ReadBook.durChapterIndex = ReadBook.chapterSize - 1
             }
-            ReadBook.loadContent(resetPageOffset = isSameBook)
+            ReadBook.loadContent(resetPageOffset = false)
         }
         if (!isSameBook || !BaseReadAloudService.isRun) {
             syncBookProgress(book)
@@ -210,20 +209,11 @@ class ReadBookViewModel(application: Application) : BaseViewModel(application) {
     /**
      * 换源
      */
-    fun changeTo(source: BookSource, book: Book, toc: List<BookChapter>) {
+    fun changeTo(book: Book, toc: List<BookChapter>) {
         changeSourceCoroutine?.cancel()
         changeSourceCoroutine = execute {
             ReadBook.upMsg(context.getString(R.string.loading))
             ReadBook.book?.changeTo(book, toc)
-            val nextChapter = toc.getOrElse(book.durChapterIndex) {
-                toc.first()
-            }
-            WebBook.getContentAwait(
-                bookSource = source,
-                book = book,
-                bookChapter = toc[book.durChapterIndex],
-                nextChapterUrl = nextChapter.url
-            )
             appDb.bookDao.insert(book)
             appDb.bookChapterDao.insert(*toc.toTypedArray())
             ReadBook.resetData(book)
@@ -250,11 +240,25 @@ class ReadBookViewModel(application: Application) : BaseViewModel(application) {
                         WebBook.getBookInfoAwait(source, book)
                     }
                     val toc = WebBook.getChapterListAwait(source, book).getOrThrow()
-                    changeTo(source, book, toc)
-                    return@execute
+                    val chapter = toc.getOrElse(book.durChapterIndex) {
+                        toc.last()
+                    }
+                    val nextChapter = toc.getOrElse(chapter.index) {
+                        toc.first()
+                    }
+                    kotlin.runCatching {
+                        WebBook.getContentAwait(
+                            bookSource = source,
+                            book = book,
+                            bookChapter = chapter,
+                            nextChapterUrl = nextChapter.url
+                        )
+                        changeTo(book, toc)
+                        return@execute
+                    }
                 }
             }
-            throw NoStackTraceException("没有搜索到 ${name}(${author})")
+            throw NoStackTraceException("没有合适书源")
         }.onStart {
             ReadBook.upMsg(context.getString(R.string.source_auto_changing))
         }.onError {