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<button
id="appearance-switcher"
aria-label="Mudar para modo escuro"
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title="Mudar para modo escuro">
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<span class="relative block icon"><svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 512 512"><path fill="currentColor" d="M256 159.1c-53.02 0-95.1 42.98-95.1 95.1S202.1 351.1 256 351.1s95.1-42.98 95.1-95.1S309 159.1 256 159.1zM509.3 347L446.1 255.1l63.15-91.01c6.332-9.125 1.104-21.74-9.826-23.72l-109-19.7l-19.7-109c-1.975-10.93-14.59-16.16-23.72-9.824L256 65.89L164.1 2.736c-9.125-6.332-21.74-1.107-23.72 9.824L121.6 121.6L12.56 141.3C1.633 143.2-3.596 155.9 2.736 164.1L65.89 256l-63.15 91.01c-6.332 9.125-1.105 21.74 9.824 23.72l109 19.7l19.7 109c1.975 10.93 14.59 16.16 23.72 9.824L256 446.1l91.01 63.15c9.127 6.334 21.75 1.107 23.72-9.822l19.7-109l109-19.7C510.4 368.8 515.6 356.1 509.3 347zM256 383.1c-70.69 0-127.1-57.31-127.1-127.1c0-70.69 57.31-127.1 127.1-127.1s127.1 57.3 127.1 127.1C383.1 326.7 326.7 383.1 256 383.1z"/></svg>
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<button
id="search-button"
aria-label="Pesquisar (/)"
class="flex items-center gap-2 rounded-lg border bf-border-color bf-border-color-hover bg-neutral-100/50 px-2 py-1 text-sm text-neutral-500 transition-colors hover:text-primary-600 dark:bg-neutral-800/50 dark:text-neutral-400 dark:hover:text-primary-400"
title="Pesquisar (/)">
<span class="relative block icon"><svg aria-hidden="true" focusable="false" data-prefix="fas" data-icon="search" class="svg-inline--fa fa-search fa-w-16" role="img" xmlns="http://www.w3.org/2000/svg" viewBox="0 0 512 512"><path fill="currentColor" d="M505 442.7L405.3 343c-4.5-4.5-10.6-7-17-7H372c27.6-35.3 44-79.7 44-128C416 93.1 322.9 0 208 0S0 93.1 0 208s93.1 208 208 208c48.3 0 92.7-16.4 128-44v16.3c0 6.4 2.5 12.5 7 17l99.7 99.7c9.4 9.4 24.6 9.4 33.9 0l28.3-28.3c9.4-9.4 9.4-24.6.1-34zM208 336c-70.7 0-128-57.2-128-128 0-70.7 57.2-128 128-128 70.7 0 128 57.2 128 128 0 70.7-57.2 128-128 128z"/></svg>
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<kbd
id="search-shortcut-hint"
class="pointer-events-none font-sans text-xs text-neutral-500 dark:text-neutral-400"
aria-hidden="true">
⌘K
</kbd>
</button>
</nav>
</div>
<div class="flex md:hidden">
<div class="mobile-header-row relative flex items-center h-14 gap-4">
<button
id="appearance-switcher-mobile"
type="button"
aria-label="Mudar para modo escuro"
title="Mudar para modo escuro"
class="flex items-center justify-center text-neutral-900 hover:text-primary-600 dark:text-neutral-200 dark:hover:text-primary-400">
<div class="dark:hidden">
<span class="relative block icon"><svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 512 512"><path fill="currentColor" d="M32 256c0-123.8 100.3-224 223.8-224c11.36 0 29.7 1.668 40.9 3.746c9.616 1.777 11.75 14.63 3.279 19.44C245 86.5 211.2 144.6 211.2 207.8c0 109.7 99.71 193 208.3 172.3c9.561-1.805 16.28 9.324 10.11 16.95C387.9 448.6 324.8 480 255.8 480C132.1 480 32 379.6 32 256z"/></svg>
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<div class="hidden dark:block">
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</span>
</div>
</button>
<button
id="search-button-mobile"
aria-label="Pesquisar (/)"
class="flex items-center justify-center bf-icon-color-hover"
title="Pesquisar (/)">
<span class="relative block icon"><svg aria-hidden="true" focusable="false" data-prefix="fas" data-icon="search" class="svg-inline--fa fa-search fa-w-16" role="img" xmlns="http://www.w3.org/2000/svg" viewBox="0 0 512 512"><path fill="currentColor" d="M505 442.7L405.3 343c-4.5-4.5-10.6-7-17-7H372c27.6-35.3 44-79.7 44-128C416 93.1 322.9 0 208 0S0 93.1 0 208s93.1 208 208 208c48.3 0 92.7-16.4 128-44v16.3c0 6.4 2.5 12.5 7 17l99.7 99.7c9.4 9.4 24.6 9.4 33.9 0l28.3-28.3c9.4-9.4 9.4-24.6.1-34zM208 336c-70.7 0-128-57.2-128-128 0-70.7 57.2-128 128-128 70.7 0 128 57.2 128 128 0 70.7-57.2 128-128 128z"/></svg>
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<input type="checkbox" id="mobile-menu-toggle" autocomplete="off" class="hidden peer">
<label
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</label>
<div
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aria-modal="true"
aria-label=""
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class="z-50 invisible overflow-y-auto opacity-0 transition-[opacity,visibility] duration-300 peer-checked:visible peer-checked:opacity-100
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<span class="sr-only"></span>
<span class="relative block icon"><svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 320 512"><path fill="currentColor" d="M310.6 361.4c12.5 12.5 12.5 32.75 0 45.25C304.4 412.9 296.2 416 288 416s-16.38-3.125-22.62-9.375L160 301.3L54.63 406.6C48.38 412.9 40.19 416 32 416S15.63 412.9 9.375 406.6c-12.5-12.5-12.5-32.75 0-45.25l105.4-105.4L9.375 150.6c-12.5-12.5-12.5-32.75 0-45.25s32.75-12.5 45.25 0L160 210.8l105.4-105.4c12.5-12.5 32.75-12.5 45.25 0s12.5 32.75 0 45.25l-105.4 105.4L310.6 361.4z"/></svg>
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</label>
<nav
aria-label=""
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<div class="px-2">
<div class="flex items-center gap-4">
<a
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aria-label="Intersecções"
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<span class="flex items-center justify-center h-8 w-8 text-2xl">
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</span>
<span title="Intersecções" class="text-2xl font-bold tracking-tight">
Intersecções
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</a>
</div>
</div>
<div class="px-2">
<div class="flex items-center gap-4">
<a
href="/guias/"
aria-label="Guias"
class="flex grow items-center gap-4 group bf-icon-color-hover text-neutral-700 dark:text-neutral-200">
<span class="flex items-center justify-center h-8 w-8 text-2xl">
<span class="relative block icon"><svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 384 512">
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<span title="Guias" class="text-2xl font-bold tracking-tight">
Guias
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<div class="px-2">
<div class="flex items-center gap-4">
<a
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<span title="" class="text-2xl font-bold tracking-tight">
Projectos
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<label
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tabindex="0"
role="button"
aria-expanded="true"
aria-label=""
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<div class="ms-7 mt-4">
<a
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aria-label="Programação"
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<h1 class="mt-0 text-4xl font-extrabold text-neutral-900 dark:text-neutral">
Fazer Boot Por USB Num RaspberryPi 4/5
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<time datetime="2026-10-05T16:15:40&#43;01:00">5 outubro 2026</time><span class="px-2 text-primary-500">&middot;</span><span>216 palavras</span><span class="px-2 text-primary-500">&middot;</span><span title="Tempo de leitura">2 minutos</span>
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Luis Rodrigues
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<div class="text-sm text-neutral-700 dark:text-neutral-400">Entusiasta de electronica e programação</div>
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<li><a href="#instalar-raspberrypi-imager">Instalar RaspberryPi Imager</a></li>
<li><a href="#instalar-imagem-de-firmware-no-cartão-microsd">Instalar Imagem de Firmware no Cartão microSD</a></li>
<li><a href="#actualizar-o-firmware-no-rpi">Actualizar o Firmware no RPi</a></li>
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<li><a href="#instalar-raspberrypi-imager">Instalar RaspberryPi Imager</a></li>
<li><a href="#instalar-imagem-de-firmware-no-cartão-microsd">Instalar Imagem de Firmware no Cartão microSD</a></li>
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<div class="min-w-0 min-h-0 max-w-fit">
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<p><em>Pequeno guia para fazer com que o RapsberryPi 3/4/5 arranque por uma unidade externa USB.</em></p>
<hr>
<div class="admonition relative overflow-hidden rounded-lg border-l-4 my-3 px-4 py-3 shadow-sm" data-type="info">
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<div class="flex shrink-0 h-5 w-5 items-center justify-center text-lg"><span class="relative block icon"><svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 512 512"><path fill="currentColor" d="M256 0C114.6 0 0 114.6 0 256s114.6 256 256 256s256-114.6 256-256S397.4 0 256 0zM256 128c17.67 0 32 14.33 32 32c0 17.67-14.33 32-32 32S224 177.7 224 160C224 142.3 238.3 128 256 128zM296 384h-80C202.8 384 192 373.3 192 360s10.75-24 24-24h16v-64H224c-13.25 0-24-10.75-24-24S210.8 224 224 224h32c13.25 0 24 10.75 24 24v88h16c13.25 0 24 10.75 24 24S309.3 384 296 384z"/></svg>
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Info
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</div><div class="admonition-content mt-3 text-base leading-relaxed text-inherit"><p>Este guia só funciona para as versões RPi3, RPi4 e RPi5 (e suas variantes). Restantes versões não têm opção de arrancar o SO a partir de uma unidade externa USB, apenas por cartão microSD</p></div></div><hr>
<h2 class="relative group">Instalar RaspberryPi Imager
<div id="instalar-raspberrypi-imager" class="anchor"></div>
<span
class="absolute top-0 w-6 transition-opacity opacity-0 -start-6 not-prose group-hover:opacity-100 select-none">
<a class="text-primary-300 dark:text-neutral-700 !no-underline" href="#instalar-raspberrypi-imager" aria-label="Etiqueta">#</a>
</span>
</h2>
<p>O primeiro passo é instalar o <a href="https://www.raspberrypi.com/software/" target="_blank" rel="noreferrer">RaspberryPi Imager</a>. Pode ser descarregado e instalado em Windows, Linux e macOS.</p>
<h2 class="relative group">Instalar Imagem de Firmware no Cartão microSD
<div id="instalar-imagem-de-firmware-no-cartão-microsd" class="anchor"></div>
<span
class="absolute top-0 w-6 transition-opacity opacity-0 -start-6 not-prose group-hover:opacity-100 select-none">
<a class="text-primary-300 dark:text-neutral-700 !no-underline" href="#instalar-imagem-de-firmware-no-cart%c3%a3o-microsd" aria-label="Etiqueta">#</a>
</span>
</h2>
<p>Depois de colocar o cartão microSD no computador e correr o <code>RaspberryPi Imager</code>, selecciona a versão do RPi.</p>
<p><figure><img
class="my-0 rounded-md"
loading="lazy"
decoding="async"
fetchpriority="auto"
alt="Seleccionar o RPi alvo"
width="810"
height="608"
src="/guias/fazer-boot-por-usb-num-rpi4/rpi-boot-from-usb-1_hu_8af48424407d24e8.png"
srcset="/guias/fazer-boot-por-usb-num-rpi4/rpi-boot-from-usb-1_hu_8af48424407d24e8.png 800w, /guias/fazer-boot-por-usb-num-rpi4/rpi-boot-from-usb-1.png 1280w"
sizes="(min-width: 768px) 50vw, 65vw"
data-zoom-src="/guias/fazer-boot-por-usb-num-rpi4/rpi-boot-from-usb-1.png"></figure>
De seguida, na seccção de &lsquo;Sistema Operativo&rsquo;, escolher a opção &ldquo;Misc utility images&rdquo;
<figure><img
class="my-0 rounded-md"
loading="lazy"
decoding="async"
fetchpriority="auto"
alt="Misc utility iamges"
width="810"
height="608"
src="/guias/fazer-boot-por-usb-num-rpi4/rpi-boot-from-usb-2_hu_c829ab681df9981e.png"
srcset="/guias/fazer-boot-por-usb-num-rpi4/rpi-boot-from-usb-2_hu_c829ab681df9981e.png 800w, /guias/fazer-boot-por-usb-num-rpi4/rpi-boot-from-usb-2.png 1280w"
sizes="(min-width: 768px) 50vw, 65vw"
data-zoom-src="/guias/fazer-boot-por-usb-num-rpi4/rpi-boot-from-usb-2.png"></figure>
Seguido de &ldquo;Bootloader (Pi &lt;versão&gt; family)&rdquo;
<figure><img
class="my-0 rounded-md"
loading="lazy"
decoding="async"
fetchpriority="auto"
alt="Escolher Versão do RaspberryPi"
width="810"
height="608"
src="/guias/fazer-boot-por-usb-num-rpi4/rpi-boot-from-usb-3_hu_bc0b2dc9c0ca2f71.png"
srcset="/guias/fazer-boot-por-usb-num-rpi4/rpi-boot-from-usb-3_hu_bc0b2dc9c0ca2f71.png 800w, /guias/fazer-boot-por-usb-num-rpi4/rpi-boot-from-usb-3.png 1280w"
sizes="(min-width: 768px) 50vw, 65vw"
data-zoom-src="/guias/fazer-boot-por-usb-num-rpi4/rpi-boot-from-usb-3.png"></figure>
Nesta parte, escolhe o método de arranque que pretendes (neste caso vamos escolher USB).
<figure><img
class="my-0 rounded-md"
loading="lazy"
decoding="async"
fetchpriority="auto"
alt="Seleccionar o metodo de arranque"
width="810"
height="608"
src="/guias/fazer-boot-por-usb-num-rpi4/rpi-boot-from-usb-4_hu_7453115168621b8f.png"
srcset="/guias/fazer-boot-por-usb-num-rpi4/rpi-boot-from-usb-4_hu_7453115168621b8f.png 800w, /guias/fazer-boot-por-usb-num-rpi4/rpi-boot-from-usb-4.png 1280w"
sizes="(min-width: 768px) 50vw, 65vw"
data-zoom-src="/guias/fazer-boot-por-usb-num-rpi4/rpi-boot-from-usb-4.png"></figure>
E de seguida escolhe o cartão microSD onde é para gravar a imagem.
<figure><img
class="my-0 rounded-md"
loading="lazy"
decoding="async"
fetchpriority="auto"
alt="Selecciona o cartão microSD para ser gravada a imagem"
width="810"
height="608"
src="/guias/fazer-boot-por-usb-num-rpi4/rpi-boot-from-usb-5_hu_ffaa03ed3d8ba51c.png"
srcset="/guias/fazer-boot-por-usb-num-rpi4/rpi-boot-from-usb-5_hu_ffaa03ed3d8ba51c.png 800w, /guias/fazer-boot-por-usb-num-rpi4/rpi-boot-from-usb-5.png 1280w"
sizes="(min-width: 768px) 50vw, 65vw"
data-zoom-src="/guias/fazer-boot-por-usb-num-rpi4/rpi-boot-from-usb-5.png"></figure>
Podes saltar a parte de &lsquo;Personalização&rsquo;, e ir logo para a &lsquo;Gravação&rsquo;.</p>
<p>Depois da imagem ser gravada (e verificada) podes retirar o cartão microSD no computador.</p>
<h2 class="relative group">Actualizar o Firmware no RPi
<div id="actualizar-o-firmware-no-rpi" class="anchor"></div>
<span
class="absolute top-0 w-6 transition-opacity opacity-0 -start-6 not-prose group-hover:opacity-100 select-none">
<a class="text-primary-300 dark:text-neutral-700 !no-underline" href="#actualizar-o-firmware-no-rpi" aria-label="Etiqueta">#</a>
</span>
</h2>
<p>Vamos finalmente colocar o cartão microSD com a imagem do novo firmware no RPi e depois ligá-lo. Depois de aproximadamente 30 segundos, temos o nosso RPi com mais recente versão do firmware e, mais importante, preparado para arrancar por USB.</p>
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