diff --git a/src/app/(public)/HomeClient.tsx b/src/app/(public)/HomeClient.tsx
index fc9f7e3..68d6527 100644
--- a/src/app/(public)/HomeClient.tsx
+++ b/src/app/(public)/HomeClient.tsx
@@ -91,45 +91,93 @@ function TabButton({ id, label, active, onClick, icon }: { id: string, label: st
     );
 }
 
-function OsGuideContent({ title, steps }: { title: string, steps: string[] }) {
+function OsGuideContent({ title, steps, selectedOs, certificates, t }: { title: string, steps: string[], selectedOs: string, certificates: CaCertificate[], t: any }) {
+    const [guideCertSerial, setGuideCertSerial] = useState(certificates[0]?.serial);
+    const [copied, setCopied] = useState(false);
+    
+    const activeCert = certificates.find(c => c.serial === guideCertSerial) || certificates[0];
+    const linuxCli = activeCert?.linux_cdn_url ? `curl -sL ${activeCert.linux_cdn_url} | sudo bash` : '';
+
+    const copyCli = () => {
+        if (!linuxCli) return;
+        navigator.clipboard.writeText(linuxCli);
+        setCopied(true);
+        setTimeout(() => setCopied(false), 2000);
+    };
+
     return (
-        <div className="p-6 bg-white dark:bg-gray-800 rounded-2xl border border-gray-100 dark:border-gray-700 shadow-sm">
-            <h4 className="text-lg font-bold text-gray-900 dark:text-white mb-4 flex items-center gap-2">
-                <div className="w-1.5 h-6 bg-brand-500 rounded-full"></div>
-                {title}
-            </h4>
-            <ul className="space-y-4">
-                {steps.map((step, idx) => {
-                    const isCommand = step.includes('curl') || step.includes('bash') || step.includes('sudo');
-                    return (
+        <div className="p-8 bg-white dark:bg-gray-800 rounded-[2rem] border border-gray-100 dark:border-gray-700 shadow-sm space-y-8 animate-in fade-in slide-in-from-bottom-2 duration-500">
+            <div>
+                <h4 className="text-lg font-bold text-gray-900 dark:text-white mb-6 flex items-center gap-2">
+                    <div className="w-1.5 h-6 bg-brand-500 rounded-full"></div>
+                    {title}
+                </h4>
+                <ul className="space-y-4">
+                    {steps.map((step, idx) => (
                         <li key={idx} className="flex gap-4">
                             <span className="flex-shrink-0 w-6 h-6 rounded-full bg-brand-50 dark:bg-brand-500/10 text-brand-600 dark:text-brand-400 flex items-center justify-center text-xs font-bold border border-brand-100 dark:border-brand-500/20">
                                 {idx + 1}
                             </span>
-                            <div className="flex-1">
-                                <p className={`text-sm text-gray-600 dark:text-gray-400 leading-relaxed ${isCommand ? 'font-mono bg-gray-100 dark:bg-gray-900 px-3 py-1.5 rounded-lg border border-gray-200 dark:border-gray-700 break-all' : 'font-medium'}`}>
-                                    {step}
-                                </p>
-                            </div>
+                            <p className="text-sm text-gray-600 dark:text-gray-400 leading-relaxed font-medium">
+                                {step}
+                            </p>
                         </li>
-                    );
-                })}
-            </ul>
+                    ))}
+                </ul>
+            </div>
+
+            {selectedOs === 'linux' && (
+                <div className="pt-8 border-t border-gray-100 dark:border-gray-700 space-y-4">
+                    <div className="flex flex-col sm:flex-row sm:items-center justify-between gap-4">
+                        <div>
+                            <h5 className="font-bold text-gray-900 dark:text-white flex items-center gap-2">
+                                <span className="w-2 h-2 rounded-full bg-green-500 animate-pulse"></span>
+                                {t('guide_linux_shortcut_title')}
+                            </h5>
+                            <p className="text-xs text-gray-500 dark:text-gray-400 mt-1">{t('guide_linux_shortcut_desc')}</p>
+                        </div>
+                        
+                        {/* Cert Selector */}
+                        <div className="relative group min-w-[200px]">
+                            <select 
+                                value={guideCertSerial}
+                                onChange={(e) => setGuideCertSerial(e.target.value)}
+                                className="w-full appearance-none bg-gray-50 dark:bg-gray-900 border border-gray-200 dark:border-gray-700 rounded-xl px-4 py-2 pr-10 text-xs font-bold text-gray-700 dark:text-gray-300 focus:outline-none focus:ring-2 focus:ring-brand-500/20 transition-all cursor-pointer"
+                            >
+                                {certificates.map(c => (
+                                    <option key={c.serial} value={c.serial}>{c.name}</option>
+                                ))}
+                            </select>
+                            <div className="absolute right-3 top-1/2 -translate-y-1/2 pointer-events-none text-gray-400">
+                                <ChevronDownIcon className="w-4 h-4" />
+                            </div>
+                        </div>
+                    </div>
+
+                    <div className="relative group">
+                        <div className="font-mono text-xs bg-gray-950 text-brand-400 p-4 rounded-2xl border border-gray-800 break-all pr-12">
+                            <span className="text-gray-500 mr-2">$</span>
+                            {linuxCli || 'No Linux script available for this certificate.'}
+                        </div>
+                        <button
+                            onClick={copyCli}
+                            className={`absolute right-3 top-1/2 -translate-y-1/2 p-2 rounded-xl transition-all duration-300 active:scale-90 ${
+                                copied 
+                                ? 'bg-green-500 text-white' 
+                                : 'bg-gray-800 text-gray-400 hover:text-white hover:bg-gray-700'
+                            }`}
+                            title="Copy Command"
+                        >
+                            {copied ? <CheckIcon className="w-3.5 h-3.5" /> : <CopyIcon className="w-3.5 h-3.5" />}
+                        </button>
+                    </div>
+                </div>
+            )}
         </div>
     );
 }
 
 function CaCard({ cert, isRoot, t, selectedOs, setSelectedOs }: { cert: CaCertificate, isRoot: boolean, t: any, selectedOs: string, setSelectedOs: (os: any) => void }) {
-    const [copied, setCopied] = useState(false);
-
-    const copyLinuxCli = () => {
-        if (!cert.linux_cdn_url) return;
-        const command = `curl -sL ${cert.linux_cdn_url} | sudo bash`;
-        navigator.clipboard.writeText(command);
-        setCopied(true);
-        setTimeout(() => setCopied(false), 2000);
-    };
-
     return (
         <div className="group relative bg-white/40 dark:bg-gray-900/40 backdrop-blur-xl rounded-[2.5rem] p-8 border border-white/50 dark:border-gray-800/50 shadow-xl hover:shadow-2xl transition-all duration-500 hover:-translate-y-1">
             {/* Sync Status Badge */}
@@ -198,7 +246,7 @@ function CaCard({ cert, isRoot, t, selectedOs, setSelectedOs }: { cert: CaCertif
             </div>
             
             {cert.linux_cdn_url && (
-                 <div className="mt-4 flex gap-3">
+                 <div className="mt-4">
                      <DownloadBtn 
                         href={cert.linux_cdn_url || `/api/public/ca-certificates/${cert.serial}/download/linux`} 
                         label={t('download_linux') || "Linux (.sh)"} 
@@ -207,18 +255,6 @@ function CaCard({ cert, isRoot, t, selectedOs, setSelectedOs }: { cert: CaCertif
                         variant="gray"
                         isFullWidth
                     />
-                    <button
-                        onClick={copyLinuxCli}
-                        className={`flex items-center justify-center gap-2 px-6 py-3 rounded-2xl border font-bold text-xs transition-all duration-300 active:scale-95 ${
-                            copied 
-                            ? 'bg-green-500 text-white border-green-500 shadow-lg' 
-                            : 'bg-brand-500 text-white border-brand-500 hover:bg-brand-600 shadow-md hover:shadow-xl'
-                        }`}
-                        title="Copy CLI Command"
-                    >
-                        {copied ? <CheckIcon className="w-4 h-4" /> : <CopyIcon className="w-4 h-4" />}
-                        {copied ? (t('copied') || "Copied!") : (t('copy_cli') || "Copy CLI")}
-                    </button>
                  </div>
             )}
         </div>
@@ -290,6 +326,12 @@ const CheckIcon = ({ className }: { className?: string }) => (
     </svg>
 );
 
+const ChevronDownIcon = ({ className }: { className?: string }) => (
+    <svg className={className} fill="none" viewBox="0 0 24 24" stroke="currentColor">
+        <path strokeLinecap="round" strokeLinejoin="round" strokeWidth="2" d="M19 9l-7 7-7-7" />
+    </svg>
+);
+
 export default function HomeClient() {
     const t = useTranslations("Home");
     const [certificates, setCertificates] = useState<CaCertificate[]>([]);
@@ -503,11 +545,11 @@ export default function HomeClient() {
                                         <TabButton id="mobile" label="Android/iOS" active={selectedOs === 'mobile'} onClick={() => setSelectedOs('mobile')} icon={<MobileIcon className="w-4 h-4" />} />
                                     </div>
 
-                                    <div className="space-y-4 animate-in fade-in slide-in-from-bottom-2 duration-500">
-                                        {selectedOs === 'windows' && <OsGuideContent title="Windows Installation" steps={t.raw('guide_steps_windows')} />}
-                                        {selectedOs === 'macos' && <OsGuideContent title="macOS Installation" steps={t.raw('guide_steps_macos')} />}
-                                        {selectedOs === 'linux' && <OsGuideContent title="Linux Installation" steps={t.raw('guide_steps_linux')} />}
-                                        {selectedOs === 'mobile' && <OsGuideContent title="Mobile Installation" steps={t.raw('guide_steps_mobile')} />}
+                                    <div className="space-y-4">
+                                        {selectedOs === 'windows' && <OsGuideContent title="Windows Installation" steps={t.raw('guide_steps_windows')} selectedOs={selectedOs} certificates={certificates} t={t} />}
+                                        {selectedOs === 'macos' && <OsGuideContent title="macOS Installation" steps={t.raw('guide_steps_macos')} selectedOs={selectedOs} certificates={certificates} t={t} />}
+                                        {selectedOs === 'linux' && <OsGuideContent title="Linux Installation" steps={t.raw('guide_steps_linux')} selectedOs={selectedOs} certificates={certificates} t={t} />}
+                                        {selectedOs === 'mobile' && <OsGuideContent title="Mobile Installation" steps={t.raw('guide_steps_mobile')} selectedOs={selectedOs} certificates={certificates} t={t} />}
                                     </div>
                                 </div>
                             </div>
diff --git a/src/messages/en.json b/src/messages/en.json
index e96eabe..c7afea6 100644
--- a/src/messages/en.json
+++ b/src/messages/en.json
@@ -212,10 +212,13 @@
             "Go to 'About' > 'Certificate Trust Settings' and enable full trust."
         ],
         "guide_steps_linux": [
-            "Use the one-liner command for instant setup (recommended):",
-            "curl -sL [URL] | sudo bash",
-            "Note: Get the [URL] by right-clicking the 'Linux' download button on the certificate card above."
+            "Download the .sh installer script.",
+            "Open terminal and run: sudo bash install-*.sh",
+            "The script will automatically detect and update your CA store."
         ],
+        "guide_linux_shortcut_title": "One-liner Shortcut (Recommended)",
+        "guide_linux_shortcut_desc": "Copy and paste this command to your terminal for instant installation:",
+        "guide_linux_select_cert": "Select Certificate to install:",
         "guide_steps_mobile": [
             "Android: Settings > Security > Install from storage > CA Certificate.",
             "iOS: Install the profile, then Settings > General > About > Certificate Trust Settings."
diff --git a/src/messages/id.json b/src/messages/id.json
index b7c8bcc..855cb1d 100644
--- a/src/messages/id.json
+++ b/src/messages/id.json
@@ -212,10 +212,13 @@
             "Buka 'About' > 'Certificate Trust Settings' dan aktifkan kepercayaan penuh."
         ],
         "guide_steps_linux": [
-            "Gunakan perintah satu-baris untuk instalasi instan (disarankan):",
-            "curl -sL [URL] | sudo bash",
-            "Catatan: Dapatkan [URL] dengan klik kanan tombol 'Linux' pada kartu sertifikat di atas lalu 'Salin Alamat Link'."
+            "Unduh skrip penginstal .sh.",
+            "Buka terminal dan jalankan: sudo bash install-*.sh",
+            "Skrip akan secara otomatis mendeteksi distro dan memperbarui penyimpanan CA Anda."
         ],
+        "guide_linux_shortcut_title": "Pintas Satu-Baris (Disarankan)",
+        "guide_linux_shortcut_desc": "Salin dan tempel perintah ini ke terminal Anda untuk instalasi instan:",
+        "guide_linux_select_cert": "Pilih Sertifikat untuk diinstal:",
         "guide_steps_mobile": [
             "Android: Pengaturan > Keamanan > Instal dari penyimpanan > Sertifikat CA.",
             "iOS: Instal profil, lalu Pengaturan > Umum > Mengenai > Pengaturan Kepercayaan Sertifikat."