{"id":19569,"date":"2022-04-07T07:00:00","date_gmt":"2022-04-07T07:00:00","guid":{"rendered":"https:\/\/windowsreport.com\/fr\/?p=19569"},"modified":"2025-09-27T14:18:24","modified_gmt":"2025-09-27T11:18:24","slug":"installer-windows-11-sans-uefi","status":"publish","type":"post","link":"https:\/\/windowsreport.com\/fr\/installer-windows-11-sans-uefi\/","title":{"rendered":"Comment installer Windows 11 sans UEFI [BIOS h\u00e9rit\u00e9, MBR]"},"content":{"rendered":"\n

Windows 11 a capt\u00e9 notre attention sans aucun doute et la configuration mat\u00e9rielle ultra contraignante impos\u00e9e par Microsoft est l’une des raisons qui nous fait rester ancr\u00e9s dans ce sujet.<\/p>\n\n\n\n

Comme vous le savez d\u00e9j\u00e0, les pr\u00e9requis pour pouvoir passer \u00e0 Windows 11 portent sur de nombreux crit\u00e8res – des processeurs compatibles, \u00e0 la pr\u00e9sence d’une connexion Internet et plus encore.<\/p>\n\n\n\n

La caract\u00e9ristique sur laquelle nous allons nous pencher aujourd’hui se r\u00e9f\u00e8re \u00e0 l’obligation de d\u00e9tenir une carte m\u00e8re \u00e9quip\u00e9e du micrologiciel UEFI avec le d\u00e9marrage s\u00e9curis\u00e9 activ\u00e9.<\/p>\n\n\n

\n
\"\"<\/a><\/figure>\n<\/div>\n\n\n

Au niveau th\u00e9orique, si votre PC ne respecte pas l’une de ces conditions, l’inf\u00e2me message d’erreur Ce PC ne peut pas ex\u00e9cuter Windows 11<\/em> appara\u00eetra.<\/p>\n\n\n\n

Est-ce r\u00e9ellement le cas ? \u00c0 ce point, vous avez probablement devin\u00e9 la r\u00e9ponse…<\/p>\n\n\n\n\n\n

Voyons d’abord qu’est-ce que c’est que l’UEFI fait et pourquoi Microsoft s’en sert pour entraver l’obtention de Windows 11.<\/p>\n\n\n\n

Lorsque vous allumez votre PC pour la premi\u00e8re fois, c’est le micrologiciel qui d\u00e9marre avant Windows. Vous pouvez avoir soit BIOS, soit UEFI.<\/p>\n\n\n\n

Comment savoir si on a un BIOS ou un UEFI ?<\/h3>\n\n\n\n
    \n
  1. Dans la zone de recherche de Windows 10, ins\u00e9rez la commande msinfo32<\/strong>.<\/li>\n\n\n\n
  2. Choisissez d’ouvrir l’application Informations syst\u00e8me<\/strong>, comme indiqu\u00e9 dans la capture d’\u00e9cran ci-jointe. \"\"<\/a><\/li>\n\n\n\n
  3. Dans le volet de gauche, restez sur R\u00e9sum\u00e9 syst\u00e8me<\/strong>.<\/li>\n\n\n\n
  4. Ensuite, v\u00e9rifiez le panneau central, o\u00f9 vous devriez voir la ligne Mode Bios<\/strong>. \"\"<\/a><\/li>\n\n\n\n
  5. C’est ici que vous trouverez le type de micrologiciel embarqu\u00e9 (BIOS h\u00e9rit\u00e9 ou bien UEFI<\/em>).<\/li>\n<\/ol>\n\n\n\n

    Alternativement, vous pouvez utiliser le raccourci Windows + R<\/kbd> pour ouvrir le menu Ex\u00e9cuter<\/strong>. Dans la zone de saisie, tapez msinfo32<\/strong>. Vous serez dirigez vers les Informations syst\u00e8me<\/em>, tout comme montr\u00e9 en haut.<\/p>\n\n\n\n

    Quelle est la diff\u00e9rence entre l\u2019UEFI et le d\u00e9marrage h\u00e9rit\u00e9 ?<\/h4>\n\n\n\n

    UEFI est le successeur du BIOS. C’est essentiellement un micrologiciel qui g\u00e8re le d\u00e9marrage de votre PC. <\/p>\n\n\n\n

    Les cartes m\u00e8res modernes sont d\u00e9sormais \u00e9quip\u00e9es d’UEFI en raison de sa capacit\u00e9 de traitement plus rapide et des diverses optimisations impl\u00e9ment\u00e9es.<\/p>\n\n\n\n

    D’ailleurs, si vous poss\u00e9dez un disque dont la capacit\u00e9 d\u00e9passe 2 To, il est recommandable de passer \u00e0 UEFI tout simplement parce que le BIOS n’est pas capable de g\u00e9rer des volumes aussi grands.<\/p>\n\n\n\n

    Puis-je convertir le BIOS en UEFI ?<\/em> Voici la question du jour. Ce n’est pas parce que vous voyez la mention H\u00e9rit\u00e9<\/strong> \u00e0 c\u00f4t\u00e9 du Mode Bios<\/strong> que vous n’allez pas pouvoir passer \u00e0 Windows 11.<\/p>\n\n\n\n

    Voici comment proc\u00e9der.<\/p>\n\n\n\n

    Comment passer de Legacy \u00e0 UEFI ?<\/h2>\n\n\n\n

    1. Changez le mode de d\u00e9marrage BIOS h\u00e9rit\u00e9 en UEFI<\/h3>\n\n\n\n

    1.1. Convertissez le disque syst\u00e8me en GPT<\/h4>\n\n\n\n
      \n
    1. Le tout premier pas consiste \u00e0 confirmer que vous utilisez le BIOS h\u00e9rit\u00e9 (voir la proc\u00e9dure indiqu\u00e9e en haut pour effectuer cette v\u00e9rification).<\/li>\n\n\n\n
    2. Ensuite, nous vous conseillons de sauvegarder votre syst\u00e8me (Veuillez v\u00e9rifier notre astuce ci-dessous pour plus de d\u00e9tails).<\/li>\n\n\n\n
    3. Pour pouvoir convertir le BIOS h\u00e9rit\u00e9 en UEFI, votre disque syst\u00e8me doit forc\u00e9ment utiliser le mode de partitionnement GPT et non pas MBR.<\/li>\n\n\n\n
    4. Pour v\u00e9rifier la table correspondante \u00e0 votre disque syst\u00e8me, ouvrez le menu D\u00e9marrer<\/strong> et recherchez Gestion des disques<\/strong>.<\/li>\n\n\n\n
    5. Alternativement, vous pouvez taper diskmgmt<\/strong> dans la zone de recherche.<\/li>\n\n\n\n
    6. S\u00e9lectionnez le premier r\u00e9sultat dans la liste et faites un clique droit sur le disque contenant l’installation de Windows. \"\"<\/a><\/li>\n\n\n\n
    7. Ensuite, cliquez sur Propri\u00e9t\u00e9s<\/strong> et rendez-vous sur l’onglet Volumes<\/strong>. \"\"<\/a><\/li>\n\n\n\n
    8. Si le type de partition<\/strong> sur votre disque est MBR, il va falloir le convertir en GPT.<\/li>\n\n\n\n
    9. \u00c0 cet effet, s\u00e9lectionnez l’option Convertir en disque GPT<\/strong>.<\/li>\n<\/ol>\n\n\n\n\n\n

      Alternativement, vous pouvez utiliser l’utilitaire Diskpart<\/strong>. Voici comment proc\u00e9der :<\/p>\n\n\n\n

        \n
      1. Tapez DISKPART<\/em> dans la zone de recherche et s\u00e9lectionnez le r\u00e9sultat propos\u00e9. \"\"<\/a><\/li>\n\n\n\n
      2. Lorsque l’Invite de commandes<\/em> s’ouvre, tapez la commande suivante : list disk<\/strong> \"\"<\/a><\/li>\n\n\n\n
      3. Veuillez noter le num\u00e9ro du disque \u00e0 convertir en GPT.<\/li>\n\n\n\n
      4. Ensuite, ins\u00e9rez le num\u00e9ro du disque vis\u00e9 et saisissez la commande : convert gpt<\/strong><\/li>\n<\/ol>\n\n\n\n
        Comment passer de Legacy \u00e0 UEFI sans r\u00e9installer ?<\/h5>\n\n\n\n

        Bien que le changement de la table de partitionnement implique une perte inh\u00e9rente des donn\u00e9es conserv\u00e9es sur vos disques, il existe un moyen pour \u00e9viter ce ph\u00e9nom\u00e8ne et tout d\u00e9sagr\u00e9ment qui puisse en d\u00e9couler.<\/p>\n\n\n\n

          \n
        1. La solution consiste \u00e0 utiliser un logiciel de gestion des partitions disque.<\/li>\n\n\n\n
        2. \u00c0 cet effet, veuillez t\u00e9l\u00e9charger et installer EaseUS Partition Master Pro<\/a><\/strong>. (Il existe \u00e9galement une version gratuite, pourtant celle-ci ne couvre pas la conversion de partions). \"\"<\/a><\/li>\n\n\n\n
        3. Lancez l’outil sur votre PC et appuyez sur Commencer<\/strong> au-dessous de Partition Manager. \"\"<\/a><\/li>\n\n\n\n
        4. Ensuite, faites un clic droit sur le disque MBR que vous souhaitez convertir et choisissez Convertir en GPT<\/strong>. \"\"<\/a><\/li>\n\n\n\n
        5. Enfin, s\u00e9lectionnez Ex\u00e9cuter op\u00e9ration<\/strong> et Appliquer<\/strong>. Red\u00e9marrez votre PC pour que les changements entrent en vigueur.<\/li>\n<\/ol>\n\n\n\n

          1.2. Modifiez les param\u00e8tres de d\u00e9marrage<\/h4>\n\n\n\n
            \n
          1. Ouvrez les Param\u00e8tres<\/strong> \u00e0 partir du menu D\u00e9marrer<\/em>.<\/li>\n\n\n\n
          2. Ensuite, ouvrez la section Mise \u00e0 jour et s\u00e9curit\u00e9<\/strong>. \"\"<\/a><\/li>\n\n\n\n
          3. Dans le volet de gauche, choisissez R\u00e9cup\u00e9ration<\/strong>, puis D\u00e9marrage avanc\u00e9<\/em>.<\/li>\n\n\n\n
          4. Cliquez ensuite sur Red\u00e9marrer maintenant<\/strong>. \"\"<\/a><\/li>\n\n\n\n
          5. Choisissez D\u00e9pannage<\/em> (R\u00e9soudre les probl\u00e8mes), puis Options avanc\u00e9es<\/strong>.<\/li>\n\n\n\n
          6. Enfin, s\u00e9lectionnez Changer les param\u00e8tres du microprogramme UEFI<\/strong>, puis Red\u00e9marrer<\/em>.<\/li>\n\n\n\n
          7. Suite \u00e0 cette manipulation, vous obtiendrez acc\u00e8s aux r\u00e9glages de votre carte m\u00e8re, implicitement au menu du BIOS.<\/li>\n\n\n\n
          8. Veuillez s\u00e9lectionner Boot (\u00c9cran de d\u00e9marrage)<\/strong>, puis Mode de d\u00e9marrage<\/em>. Utilisez les fl\u00e8ches pour effectuer la s\u00e9lection et faites Entrer<\/em>.<\/li>\n\n\n\n
          9. Ici, vous pourrez remplacer le mode de d\u00e9marrage de BIOS h\u00e9rit\u00e9 par UEFI<\/em>, mettre l’UEFi sur Enabled (Activ\u00e9)<\/strong> si c’est le cas ou bien d\u00e9sactiver le d\u00e9marrage s\u00e9curis\u00e9<\/em>.<\/li>\n\n\n\n
          10. Pensez \u00e0 sauvegarder les modifications avant de quitter l’\u00e9cran.<\/li>\n\n\n\n
          11. Enfin, notez qu’il y a des cas qui permettent d’activer \u00e0 la fois les modes UEFI et BIOS h\u00e9rit\u00e9.<\/li>\n<\/ol>\n\n\n\n\n\n

            2. Modifiez le registre<\/h3>\n\n\n\n
              \n
            1. Cr\u00e9ez une cl\u00e9 USB d\u2019installation de Windows 11 et utilisez-l\u00e0 pour d\u00e9marrer votre machine.<\/li>\n\n\n\n
            2. Ensuite, utilisez le raccourci Maj + F10<\/kbd> pour lancer le menu Ex\u00e9cuter<\/em>.<\/li>\n\n\n\n
            3. Dans la zone de saisie, tapez regedit<\/strong> et faites Entrer<\/em>. \"executer_regedit_editeur<\/a><\/li>\n\n\n\n
            4. Lorsque l\u2019\u00c9diteur du Registre s’ouvre, identifiez cette entr\u00e9e dans le volet de gauche : HKEY_LOCAL_MACHINE\\SYSTEM\\Setup<\/strong><\/code><\/li>\n\n\n\n
            5. Faites un clic droit sur la cl\u00e9 Setup<\/strong> et s\u00e9lectionnez Nouveau<\/em>, puis Cl\u00e9<\/strong> et Valeur DWORD 32 bits<\/strong>. \"\"<\/a><\/li>\n\n\n\n
            6. Veuillez nommer cette nouvelle cl\u00e9 LabConfig<\/strong> et faites \u00e0 nouveau un clic droit dessus. <\/li>\n\n\n\n
            7. Entrez le nom BypassSecureBootCheck<\/strong> et d\u00e9finissez sa valeur sur 00000001<\/em>, puis enregistrez.<\/li>\n\n\n\n
            8. Fermez l’\u00c9diteur du registre ainsi que le menu Ex\u00e9cuter<\/em> et proc\u00e9dez \u00e0 l’installation de Windows 11 sans d\u00e9marrage s\u00e9curis\u00e9 compatible avec UEFI.<\/li>\n<\/ol>\n\n\n\n

              Notez que toute mauvaise manipulation au niveau du registre est susceptible d\u2019endommager irr\u00e9versiblement votre PC. Pour cette raison, nous vous conseillons d\u2019agir prudemment. <\/p>\n\n\n\n

              Assurez-vous d\u2019utiliser un bon nettoyeur de registre<\/a>, qui vous permet de restaurer cette base de donn\u00e9es, si tel est le cas, inclusivement la r\u00e9paration des cl\u00e9s corrompues du registre.<\/p>\n\n\n\n

              Pas d’UEFI ? Pas de probl\u00e8me ! Voici comment installer Windows 11 sans UEFI – soit en d\u00e9sactivant le d\u00e9marrage s\u00e9curis\u00e9 directement du registre, soit en changent le Mode BIOS h\u00e9rit\u00e9 en UEFI.<\/p>\n\n\n\n

              Alternativement, vous pouvez cr\u00e9er une cl\u00e9 USB modifi\u00e9e ou bien un fichier ISO modifi\u00e9 de Windows 11 pour \u00e9viter la v\u00e9rification du module TPM et du d\u00e9marrage s\u00e9curis\u00e9 sans devoir modifier le registre pour chaque installation.<\/p>\n","protected":false},"excerpt":{"rendered":"

              Windows 11 a capt\u00e9 notre attention sans aucun doute et la configuration mat\u00e9rielle ultra contraignante impos\u00e9e par Microsoft est l’une des raisons qui nous fait rester ancr\u00e9s dans ce sujet. Comme vous le savez d\u00e9j\u00e0, les pr\u00e9requis pour pouvoir passer \u00e0 Windows 11 portent sur de nombreux crit\u00e8res – des processeurs compatibles, \u00e0 la pr\u00e9sence […]<\/p>\n","protected":false},"author":252,"featured_media":19600,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"_enabled_clarity":"","footnotes":""},"categories":[10842],"tags":[],"work":[10860,10861,10862],"class_list":["post-19569","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-windows-11-guides","work-exclude-first-cta","work-exclude-last-cta","work-exclude-mid-cta"],"acf":[],"yoast_head":"\nComment installer Windows 11 sans UEFI [BIOS h\u00e9rit\u00e9, MBR]<\/title>\n<meta name=\"description\" content=\"Voici installer Windows 11 sans UEFI. 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