{"id":401271,"date":"2025-09-17T05:25:40","date_gmt":"2025-09-17T09:25:40","guid":{"rendered":"https:\/\/www.macobserver.com\/actualites\/comment-retrograder-dios-26-vers-ios-18-5\/"},"modified":"2025-09-18T08:39:56","modified_gmt":"2025-09-18T12:39:56","slug":"comment-retrograder-dios-26-vers-ios-18-5","status":"publish","type":"post","link":"https:\/\/www.macobserver.com\/fr\/guide-pratique\/comment-retrograder-dios-26-vers-ios-18-5\/","title":{"rendered":"Comment r\u00e9trograder d&rsquo;iOS 26 vers iOS 18.5"},"content":{"rendered":"\n<p>Si vous avez mis \u00e0 jour vers <strong>iOS 26<\/strong> et que vous le regrettez, peut-\u00eatre que votre iPhone semble lent, que l&rsquo;autonomie de la batterie s&rsquo;est effondr\u00e9e, ou que certaines applications ne fonctionnent pas encore bien, vous pouvez encore revenir en arri\u00e8re. Apple signe actuellement <strong>iOS 18.5<\/strong>, ce qui signifie que vous pouvez r\u00e9trograder votre appareil tant que cette fen\u00eatre reste ouverte. Une fois qu&rsquo;Apple cessera de signer la version 18.5, les r\u00e9trogradations ne seront plus possibles.  <\/p>\n\n<p>Voici comment restaurer votre iPhone en toute s\u00e9curit\u00e9.<\/p>\n\n<h2 class=\"wp-block-heading\">Ce qu&rsquo;il faut savoir avant de commencer<\/h2>\n\n<ul class=\"wp-block-list\">\n<li><strong>Les sauvegardes ne fonctionnent pas \u00e0 rebours<\/strong> : Si vous avez cr\u00e9\u00e9 une sauvegarde sur iOS 26, vous ne pouvez pas la restaurer sur iOS 18.5. Vous aurez besoin d&rsquo;une ancienne sauvegarde de la version 18.5 ou devrez configurer votre iPhone comme neuf. <\/li>\n\n\n\n<li><strong>Vous avez besoin d&rsquo;un Mac ou d&rsquo;un PC<\/strong> avec Finder (macOS) ou iTunes (Windows).<\/li>\n\n\n\n<li><strong>Vous avez besoin du fichier IPSW d&rsquo;iOS 18.5<\/strong> pour votre mod\u00e8le d&rsquo;iPhone exact. T\u00e9l\u00e9chargez uniquement les fichiers IPSW depuis des sources fiables. <\/li>\n\n\n\n<li><strong>Cela efface votre iPhone<\/strong> : La r\u00e9trogradation supprime tout, alors sauvegardez ce que vous pouvez d&rsquo;abord.<\/li>\n<\/ul>\n\n<h2 class=\"wp-block-heading\">\u00c9tape 1 : t\u00e9l\u00e9chargez l&rsquo;IPSW d&rsquo;iOS 18.5<\/h2>\n\n<p>Rendez-vous sur un site r\u00e9put\u00e9 comme <a target=\"_blank\" href=\"https:\/\/ipsw.me\/product\/iPhone\">ipsw.me<\/a> et t\u00e9l\u00e9chargez le <strong>firmware iOS 18.5<\/strong> pour votre mod\u00e8le d&rsquo;iPhone. Assurez-vous qu&rsquo;il indique \u00ab Sign\u00e9 \u00bb \u2014 cela signifie qu&rsquo;Apple autorise encore l&rsquo;installation. <\/p>\n\n<h2 class=\"wp-block-heading\">\u00c9tape 2 : connectez votre iPhone \u00e0 votre ordinateur<\/h2>\n\n<ol class=\"wp-block-list\">\n<li>Sur un Mac ex\u00e9cutant macOS Catalina ou une version ult\u00e9rieure, ouvrez <strong>Finder<\/strong>.<\/li>\n\n\n\n<li>Sur Windows ou une version ant\u00e9rieure de macOS, ouvrez <strong>iTunes<\/strong>.<\/li>\n\n\n\n<li>Branchez votre iPhone avec un c\u00e2ble Lightning ou USB-C.<\/li>\n<\/ol>\n\n<h2 class=\"wp-block-heading\">\u00c9tape 3 : mettez votre iPhone en mode de r\u00e9cup\u00e9ration<\/h2>\n\n<p>Selon votre mod\u00e8le d&rsquo;iPhone :<\/p>\n\n<ul class=\"wp-block-list\">\n<li><strong>iPhone 8 et plus r\u00e9cent<\/strong> : Appuyez rapidement et rel\u00e2chez <strong>Volume +<\/strong>, puis <strong>Volume &#8211;<\/strong>, puis maintenez le <strong>bouton lat\u00e9ral<\/strong> jusqu&rsquo;\u00e0 ce que vous voyiez l&rsquo;\u00e9cran du mode de r\u00e9cup\u00e9ration.<\/li>\n<\/ul>\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"460\" height=\"530\" src=\"https:\/\/www.macobserver.com\/wp-content\/uploads\/2025\/09\/image-67.png\" alt=\"mode de r&#xE9;cup&#xE9;ration iphone\" class=\"wp-image-401029\" srcset=\"https:\/\/www.macobserver.com\/wp-content\/uploads\/2025\/09\/image-67.png 460w, https:\/\/www.macobserver.com\/wp-content\/uploads\/2025\/09\/image-67-260x300.png 260w, https:\/\/www.macobserver.com\/wp-content\/uploads\/2025\/09\/image-67-182x210.png 182w, https:\/\/www.macobserver.com\/wp-content\/uploads\/2025\/09\/image-67-400x461.png 400w\" sizes=\"auto, (max-width: 460px) 100vw, 460px\" \/><\/figure>\n<\/div>\n<ul class=\"wp-block-list\">\n<li><strong>iPhone 7\/7 Plus<\/strong> : Maintenez <strong>Volume &#8211; + bouton lat\u00e9ral<\/strong> jusqu&rsquo;\u00e0 ce que le mode de r\u00e9cup\u00e9ration apparaisse.<\/li>\n\n\n\n<li><strong>iPhone 6s ou ant\u00e9rieur<\/strong> : Maintenez <strong>Accueil + bouton sup\u00e9rieur\/lat\u00e9ral<\/strong>.<\/li>\n<\/ul>\n\n<h2 class=\"wp-block-heading\">\u00c9tape 4 : installez iOS 18.5<\/h2>\n\n<ol class=\"wp-block-list\">\n<li>Dans Finder ou iTunes, localisez votre iPhone.<\/li>\n\n\n\n<li>Maintenez <strong>Option (Mac)<\/strong> ou <strong>Maj (Windows)<\/strong> et cliquez sur <strong>Restaurer l&rsquo;iPhone<\/strong>.<\/li>\n\n\n\n<li>S\u00e9lectionnez le <strong>fichier IPSW d&rsquo;iOS 18.5<\/strong> que vous avez t\u00e9l\u00e9charg\u00e9.<\/li>\n\n\n\n<li>Confirmez, et laissez votre ordinateur effacer votre iPhone et installer iOS 18.5.<\/li>\n<\/ol>\n\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"768\" height=\"323\" src=\"https:\/\/www.macobserver.com\/wp-content\/uploads\/2025\/09\/image-68.png\" alt=\"restaurer iphone dans finder\" class=\"wp-image-401033\" srcset=\"https:\/\/www.macobserver.com\/wp-content\/uploads\/2025\/09\/image-68.png 768w, https:\/\/www.macobserver.com\/wp-content\/uploads\/2025\/09\/image-68-300x126.png 300w, https:\/\/www.macobserver.com\/wp-content\/uploads\/2025\/09\/image-68-330x139.png 330w, https:\/\/www.macobserver.com\/wp-content\/uploads\/2025\/09\/image-68-400x168.png 400w, https:\/\/www.macobserver.com\/wp-content\/uploads\/2025\/09\/image-68-600x252.png 600w\" sizes=\"auto, (max-width: 768px) 100vw, 768px\" \/><\/figure>\n\n<p>Ce processus peut prendre 10 \u00e0 20 minutes.<\/p>\n\n<h2 class=\"wp-block-heading\">\u00c9tape 5 : configurez votre iPhone<\/h2>\n\n<p>Une fois la r\u00e9trogradation termin\u00e9e :<\/p>\n\n<ul class=\"wp-block-list\">\n<li>Si vous avez une <strong>ancienne sauvegarde d&rsquo;iOS 18.5<\/strong>, restaurez-la.<\/li>\n\n\n\n<li>Sinon, configurez comme un nouvel appareil et synchronisez vos donn\u00e9es depuis iCloud, Photos, Mail ou d&rsquo;autres services.<\/li>\n<\/ul>\n\n<h2 class=\"wp-block-heading\">Devriez-vous r\u00e9trograder ?<\/h2>\n\n<p>iOS 26 apporte de nouvelles fonctionnalit\u00e9s comme <a target=\"_blank\" href=\"https:\/\/www.macobserver.com\/fr\/guide-pratique\/comment-activer-et-utiliser-le-filtrage-dappels-dans-ios-26\/\">le filtrage d&rsquo;appels<\/a>, <a target=\"_blank\">l&rsquo;assistance d&rsquo;attente<\/a> et <a target=\"_blank\">Genmoji<\/a>. Mais si votre exp\u00e9rience quotidienne est pire, que ce soit \u00e0 cause de <a target=\"_blank\" href=\"https:\/\/www.macobserver.com\/fr\/guide-pratique\/pourquoi-ios-26-est-il-si-lent-causes-et-solutions\/\">ralentissements<\/a> ou de <a target=\"_blank\" href=\"https:\/\/www.macobserver.com\/fr\/guide-pratique\/decharge-de-la-batterie-ios-26-7-ajustements-eprouves-pour-la-corriger\/\">d\u00e9charge de batterie<\/a>, revenir \u00e0 la version 18.5 peut vous donner un peu de r\u00e9pit jusqu&rsquo;\u00e0 ce qu&rsquo;Apple am\u00e9liore les choses. <\/p>\n\n<h2 class=\"wp-block-heading\">Guides connexes<\/h2>\n\n<ul class=\"wp-block-list\">\n<li><a target=\"_blank\" href=\"https:\/\/www.macobserver.com\/fr\/guide-pratique\/ios-26-bloque-sur-mise-a-jour-demandee-voici-comment-le-corriger\/\">iOS 26 bloqu\u00e9 sur Mise \u00e0 jour demand\u00e9e ? Corrigez-le <\/a><\/li>\n\n\n\n<li><a target=\"_blank\" href=\"https:\/\/www.macobserver.com\/fr\/ios-fr\/comment-corriger-la-surchauffe-dios-26-solution-rapide\/\">Surchauffe d&rsquo;iOS 26 : comment la corriger<\/a><\/li>\n\n\n\n<li><a target=\"_blank\" href=\"https:\/\/www.macobserver.com\/fr\/guide-pratique\/tous-les-bugs-et-problemes-signales-dios-26-avec-leurs-correctifs\/\">Tous les bogues iOS 26 signal\u00e9s et leurs corrections<\/a><\/li>\n<\/ul>\n\n<p>Vous pouvez r\u00e9trograder d&rsquo;<strong>iOS 26 vers iOS 18.5<\/strong> tant qu&rsquo;Apple le signe encore. T\u00e9l\u00e9chargez l&rsquo;IPSW, restaurez avec Finder ou iTunes, et reconfigurez votre iPhone. Rappelez-vous simplement que les sauvegardes d&rsquo;iOS 26 ne fonctionneront pas \u2014 vous aurez besoin d&rsquo;une ancienne sauvegarde ou devrez repartir de z\u00e9ro.  <\/p>\n\n<p><\/p>\n\n<p><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Si vous avez mis \u00e0 jour vers iOS 26 et que vous le regrettez, peut-\u00eatre que votre iPhone semble lent, que l&rsquo;autonomie de la batterie s&rsquo;est effondr\u00e9e, ou que certaines applications ne fonctionnent pas encore bien, vous pouvez encore revenir en arri\u00e8re. Apple signe actuellement iOS 18.5, ce qui signifie que vous pouvez r\u00e9trograder votre [&hellip;]<\/p>\n","protected":false},"author":19675,"featured_media":389483,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[82137,82101],"tags":[82233],"work":[],"class_list":["post-401271","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-guide-pratique","category-non-categorise","tag-mises-a-jour-ios-26"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v28.0 (Yoast SEO v28.0) - https:\/\/yoast.com\/product\/yoast-seo-premium-wordpress\/ -->\n<title>Comment r\u00e9trograder d&#039;iOS 26 vers iOS 18.5<\/title>\n<meta name=\"description\" content=\"Apple signe actuellement iOS 18.5, ce qui signifie que vous pouvez r\u00e9trograder votre appareil tant que cette fen\u00eatre reste ouverte.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.macobserver.com\/fr\/guide-pratique\/comment-retrograder-dios-26-vers-ios-18-5\/\" \/>\n<meta property=\"og:locale\" content=\"fr_FR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Comment r\u00e9trograder d&#039;iOS 26 vers iOS 18.5\" \/>\n<meta property=\"og:description\" content=\"Apple signe actuellement iOS 18.5, ce qui signifie que vous pouvez r\u00e9trograder votre appareil tant que cette fen\u00eatre reste ouverte.\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.macobserver.com\/fr\/guide-pratique\/comment-retrograder-dios-26-vers-ios-18-5\/\" \/>\n<meta property=\"og:site_name\" content=\"The Mac Observer\" \/>\n<meta property=\"article:publisher\" content=\"https:\/\/www.facebook.com\/MacObserver\" \/>\n<meta property=\"article:published_time\" 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