docs: install from a zipped pack or an old card

The FAQ said to unzip a pack before --from-pack, which reads the ZIP, its parts or their folder as they are. A lost or wiped card now has its answer, --from, linked to Copy from an old card. Can I play without the BIOS goes, Do I need BIOS files answers it.

tests/test_site_r4_merge.py

@@ -150,6 +150,33 @@ class OptionsGlanceFromTheParser(unittest.TestCase):
             sitediagrams.expand_glance(f"# x\n\n{sitediagrams.GLANCE_HEADING}\n\n- a\n\n## y\n")
 
 
+class FaqInstallsFromWhatYouHold(unittest.TestCase):
+    """--from-pack reads the ZIP itself, and a wiped card had no answer."""
+
+    def setUp(self):
+        self.faq = (REPO_ROOT / "wiki" / "faq.md").read_text(encoding="utf-8")
+
+    def _section(self, heading: str) -> str:
+        return self.faq.split(f"## {heading}\n", 1)[1].split("\n## ", 1)[0]
+
+    def test_no_unzip_before_from_pack(self):
+        section = " ".join(self._section("No internet on the device?").split())
+        self.assertIn("point `--from-pack` at your ZIP, still zipped", section)
+        self.assertNotIn("unzip", section)
+        install = (REPO_ROOT / "install.py").read_text(encoding="utf-8")
+        self.assertIn("Install from a pack already downloaded: its ZIP, one of its parts",
+                      (REPO_ROOT / "wiki" / "installer.md").read_text(encoding="utf-8"))
+        self.assertIn('"--from-pack"', install)
+
+    def test_a_wiped_card_links_the_copy(self):
+        section = self._section("Lost or wiped card?")
+        self.assertIn("`--from`", section)
+        self.assertIn("(installer.md#copy-from-an-old-card)", section)
+        installer = (REPO_ROOT / "wiki" / "installer.md").read_text(encoding="utf-8")
+        self.assertIn("## Copy from an old card { #copy-from-an-old-card }", installer)
+        self.assertIn('"--from"', (REPO_ROOT / "install.py").read_text(encoding="utf-8"))
+
+
 @unittest.skipUnless((DIST / "systems" / "arcade-acclaim-zn-1" / "index.html").is_file(),
                      "site not built")
 class BuiltCrumbs(unittest.TestCase):

wiki/faq.md

@@ -29,7 +29,7 @@ No. To keep only your region's BIOS, add it, like `--region us`.
 
 ## Does the BIOS set the game's language?
 
-Rarely. It comes from the game. Some games follow the console's setting, like Flycast's **Language**
+Rarely. It comes from the game. Some follow the console's setting, like Flycast's **Language**
 option.
 
 ## Zip or unzip? { #zip-or-unzip }
@@ -53,18 +53,13 @@ Game sets must match the emulator's version:
   emulator's menu.
 - **Keys** unlock encrypted games, like `prod.keys` for Switch.
 
-## Can I play without the BIOS?
-
-Sometimes, with an emulator's stand-in, but some games fail.
-
 ## Is the command safe? { #is-piping-the-installer-into-a-shell-safe }
 
 - It stops if the installer does not match its expected fingerprint, and
   checks each file.
-- It writes in your BIOS folder, and for some emulators your save folder.
-- It never touches a game or a save.
-- It keeps each file it replaces in `retrobios-backup`. `--restore` puts it
-  back.
+- It writes in your BIOS folder, and some emulators' save folder.
+- It never touches a game or save.
+- It keeps each file it replaces in `retrobios-backup`, for `--restore`.
 
 Read them first: [install.sh](https://github.com/Abdess/retrobios/blob/main/install.sh),
 [install.ps1](https://github.com/Abdess/retrobios/blob/main/install.ps1),
@@ -92,8 +87,13 @@ curl -fsSL https://raw.githubusercontent.com/Abdess/retrobios/main/install.sh \
 
 ## No internet on the device?
 
-Fill its folder from a computer, as above, or unzip your ZIP and check it with
-`--from-pack`: [Without a network](installer.md#without-a-network-offline-install).
+Fill its folder from a computer, as above, or point `--from-pack` at
+your ZIP, still zipped: [Without a network](installer.md#without-a-network-offline-install).
+
+## Lost or wiped card?
+
+`--from` copies BIOS files from an old card or a backup:
+[Copy from an old card](installer.md#copy-from-an-old-card).
 
 ## My setup is not in the list