ios27 如何保留数据降级 26

没遇到这些问题， 看看有没有升级前的 iCloud 备份

bug 确实多。 断网都时不时出现

hhh iOS 27.0 beta 1 贵宾一位

我也是升级后悔死了。我现在都还没索引完。还出现 sim 卡自动失去信号，蓝牙断链，siri 设置不上等一系列问题

理论上高版本无法降级低版本保资料，之前 iOS15 还是哪个版本刚改控制中心为圆形的时候，可以通过改备份文件里的文件在低版本中恢复，现在不知道行不行。我建议直接电脑备份下微信的文件，重刷 iOS26 ，全部重新下载，照片都在 iCloud 。

爱思助手备份，然后改备份的版本信息，然后降级，恢复，几乎所有资料都在，但亲测我这有一些 app 需要手动安装

首先，你需要有升级 iOS27 之前的备份。
其次，抹掉手机，dfu 模式升级到 iOS26 未关闭激活的版本
第三，恢复备份。

"最基本通话上网都不进行测试"
我寻思这不就是测试版吗

测试前不备份吗

你知道 dev beta 不注册成开发者是不能更的吗

升级 dev 前不备份啊

一般情况下降级都无法保留数据。可手动 iCloud 数据备份或手动导出数据备份。测试版正常来说给开发者提前为新特性适配兼容使用，不是拿日常生产机来测试

第一个 beta1 不建议普通人食用。

我都是用备用机 SE3 先尝鲜。等觉得可以正常用了，主力机再升级。

26 太卡了啊。
真的是越来越垃圾了。
27 好歹解决了卡顿的问题。

有备份的话好说，没有的话好像不太行

每年都有这种贴，前仆后继

盖天覆地地宣传，每一个 iOS ，macOS 等各种 OS 体验报告，例如少数派首位的明显的位置：「不过，需要注意的是，开发者预览版目前仅面向开发者提供，旨在帮助开发者提前适配新版系统或是开发新功能，即便是性能提升显著的 macOS 27 Developer Beta 版本，我们依旧暂不推荐你作为生产环境使用的操作系统，如你想要体验，请使用双系统或者通过移动外置驱动器安装的方式体验。」

每一年都会有一大堆尝鲜报告首位都会有：不要作死，要作死就要备份，要用备用机！！！

——————

备份你的 iOS 设备
iOS Beta 版尚处于开发阶段，因此部分应用程序和服务可能不会如期正常工作，并且其数据可能无法向后兼容。安装该软件前，请确保使用 iTunes 备份你的 iOS 设备。

ios26 也不行，新手机 17pm 感觉不流畅，系统使用方面感觉还没有 15pm 顺滑！

你知道 dev beta 是啥意思不

@BigPiggggg {"app_name":"Preferences","timestamp":"2026-06-17 16:08:02.00 +0800","app_version":"1.0","slice_uuid":"b9341e38-5f2d-3f97-a616-8eead7f8bf13","build_version":"27.0.37.105","platform":2,"bundleID":"com.apple.Preferences","share_with_app_devs":0,"is_first_party":1,"bug_type":"309","os_version":"iPhone OS 27.0 (24A5355q)","roots_installed":0,"name":"Preferences","incident_id":"CA619768-02D8-4110-AF83-BC8F32AA6B10"}
{
"uptime" : 250,
"procRole" : "Foreground",
"version" : 2,
"userID" : 501,
"deployVersion" : 210,
"modelCode" : "iPhone16,1",
"coalitionID" : 528,
"osVersion" : {
"isEmbedded" : true,
"train" : "iPhone OS 27.0",
"releaseType" : "Beta",
"build" : "24A5355q"
},
"captureTime" : "2026-06-17 16:08:01.7224 +0800",
"codeSigningMonitor" : 2,
"incident" : "CA619768-02D8-4110-AF83-BC8F32AA6B10",
"pid" : 582,
"translated" : false,
"cpuType" : "ARM-64",
"procLaunch" : "2026-06-17 16:07:28.0206 +0800",
"procStartAbsTime" : 5414331871,
"procExitAbsTime" : 6222053674,
"procName" : "Preferences",
"procPath" : "\/Applications\/Preferences.app\/Preferences",
"bundleInfo" : {"CFBundleShortVersionString":"1.0","CFBundleVersion":"27.0.37.105","CFBundleIdentifier":"com.apple.Preferences"},
"storeInfo" : {"deviceIdentifierForVendor":"C760106B-CD62-4EB0-A98C-334B7C1D3B7A"},
"parentProc" : "launchd",
"parentPid" : 1,
"coalitionName" : "com.apple.Preferences",
"crashReporterKey" : "9ff88ee414fe40abec718fc0c411730f28f5bd4c",
"appleIntelligenceStatus" : {"state":"available"},
"chargingStatus" : {"externalSourceConnected":true},
"bootProgressRegister" : "0x2080000c",
"wasUnlockedSinceBoot" : 1,
"isLocked" : 0,
"codeSigningID" : "com.apple.Preferences",
"codeSigningTeamID" : "",
"codeSigningFlags" : 570434305,
"codeSigningValidationCategory" : 1,
"codeSigningTrustLevel" : 9,
"codeSigningAuxiliaryInfo" : 523655375527512346,
"instructionByteStream" : {"beforePC":"fyMD1f17v6n9AwCRxe3\/l78DAJH9e8Go\/w9f1sADX9YQKYDSARAA1A==","atPC":"AwEAVH8jA9X9e7+p\/QMAkbrt\/5e\/AwCR\/XvBqP8PX9bAA1\/WECeA0g=="},
"bootSessionUUID" : "915FC8F5-F347-4A48-9D2B-EE1212701C72",
"basebandVersion" : "4.01.05",
"exception" : {"codes":"0x0000000000000000, 0x0000000000000000","rawCodes":[0,0],"type":"EXC_CRASH","signal":"SIGABRT"},
"termination" : {"flags":0,"code":6,"namespace":"SIGNAL","indicator":"Abort trap: 6","byProc":"Preferences","byPid":582},
"asi" : {"libsystem_c.dylib":["abort() called"]},
"exceptionReason" : {"arguments":["UIThreadSafeNode","_smartReplyUpdateInProgress","0x7d941f6aa0"],"format_string":"-[%s %s]: unrecognized selector sent to instance %p","name":"NSInvalidArgumentException","type":"objc-exception","composed_message":"-[UIThreadSafeNode _smartReplyUpdateInProgress]: unrecognized selector sent to instance 0x7d941f6aa0","class":"NSException"},
"lastExceptionBacktrace" : [{"imageOffset":620624,"symbol":"__exceptionPreprocess","symbolLocation":120,"imageIndex":16},{"imageOffset":50304,"symbol":"objc_exception_throw","symbolLocation":88,"imageIndex":15},{"imageOffset":1638564,"symbol":"-[NSObject(NSObject) __retain_OA]","symbolLocation":0,"imageIndex":16},{"imageOffset":342348,"symbol":"___forwarding___","symbolLocation":880,"imageIndex":16},{"imageOffset":343056,"symbol":"_CF_forwarding_prep_0","symbolLocation":96,"imageIndex":16},{"imageOffset":24000128,"symbol":"__105-[UIPredictionViewController _performThrottledUpdateUIWithAutocorrectionList:candidateGenerationContext:]_block_invoke","symbolLocation":492,"imageIndex":17},{"imageOffset":8311228,"symbol":"-[UIPredictionViewController _performThrottledUpdateUIWithAutocorrectionList:candidateGenerationContext:]","symbolLocation":616,"imageIndex":17},{"imageOffset":8310028,"symbol":"-[UIPredictionViewController 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refreshPresentation]","symbolLocation":420,"imageIndex":17},{"imageOffset":16768928,"symbol":"-[UIInputWindowController updateForKeyplaneChangeWithContext:]","symbolLocation":704,"imageIndex":17},{"imageOffset":16850096,"symbol":"-[UIInputWindowControllerHostingItem updateForKeyplaneChangeWithContext:]","symbolLocation":68,"imageIndex":17},{"imageOffset":4377648,"symbol":"-[_UIRemoteKeyboards performOnControllers:]","symbolLocation":260,"imageIndex":17},{"imageOffset":16737432,"symbol":"-[UIInputSetHostView _didChangeKeyplaneWithContext:]","symbolLocation":316,"imageIndex":17},{"imageOffset":5942472,"symbol":"-[UIView(UIKB_UIViewExtras) _didChangeKeyplaneWithContext:]","symbolLocation":56,"imageIndex":17},{"imageOffset":15427292,"symbol":"-[_UIKBCompatInputView _didChangeKeyplaneWithContext:]","symbolLocation":80,"imageIndex":17},{"imageOffset":5942472,"symbol":"-[UIView(UIKB_UIViewExtras) _didChangeKeyplaneWithContext:]","symbolLocation":56,"imageIndex":17},{"imageOffset":5873224,"symbol":"-[UIKeyboard _didChangeKeyplaneWithContext:]","symbolLocation":280,"imageIndex":17},{"imageOffset":5942472,"symbol":"-[UIView(UIKB_UIViewExtras) _didChangeKeyplaneWithContext:]","symbolLocation":56,"imageIndex":17},{"imageOffset":5872840,"symbol":"-[UIKeyboardImpl _didChangeKeyplaneWithContext:]","symbolLocation":604,"imageIndex":17},{"imageOffset":5942472,"symbol":"-[UIView(UIKB_UIViewExtras) _didChangeKeyplaneWithContext:]","symbolLocation":56,"imageIndex":17},{"imageOffset":16214808,"symbol":"-[UIKeyboardLayoutStar(UIKeyboardLayoutJapanese50OnFlick) _didChangeKeyplaneWithContext:]","symbolLocation":88,"imageIndex":17},{"imageOffset":6712552,"symbol":"-[UIKeyboardLayoutStar createLayoutFromName:]","symbolLocation":5004,"imageIndex":17},{"imageOffset":8253404,"symbol":"-[UIKeyboardLayoutStar 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我以为 Public Beta 出了呢，这不是开发者测试版吗，有 BUG 不是很正常，而且升级之前有提示备份吧。

你第一次用 dev beta? 每次大版本 dev beta 都一堆 BUG 和问题不是常识吗, 直接用自己主力机更新也是心大...

6 楼说的对的，我一般用 mac 整机全部备份，然后找备份文件，修改系统版本号，先刷同版本的纯净系统，再还原备份系统。低版本系统仍开放通道才行，或者你买个低系统的手机，但最好不要跨系统版本太大，比如备份 26.4 ，还原 18.2 的，可能会有问题。