tests: update emulator download scripts

diff --git a/tests/download_emulators.py b/tests/download_emulators.py
new file mode 100755
index 000000000..43b237471
--- /dev/null
+++ b/tests/download_emulators.py
@@ -0,0 +1,150 @@
+#!/usr/bin/env python3
+import json
+import stat
+from http import HTTPStatus
+from pathlib import Path
+from typing import TypeAlias
+
+import click
+import requests
+from emulators import ALL_MODELS, gen_from_model
+
+EmulatorDict: TypeAlias = dict[str, list[str]]
+
+
+OLDEST_AVAILABLE = {
+    "legacy": (1, 6, 2),
+    "core": (2, 0, 8),
+}
+
+EMULATORS_URL_PREFIX = "https://data.trezor.io/dev/firmware/releases/emulators-new"
+
+TESTS_DIR = Path(__file__).resolve().parent
+SAVE_DIR = TESTS_DIR / "emulators"
+RELEASES_JSON = TESTS_DIR.parent / "common" / "releases.json"
+
+
+class MissingArtifactError(Exception):
+    model: str
+    version: str
+
+    def __init__(self, model: str, version: str) -> None:
+        self.model = model
+        self.version = version
+        super().__init__()
+
+
+class KnownMissingArtifactError(MissingArtifactError):
+    pass
+
+
+class Emulator:
+    version: str
+    model: str
+    url: str
+    save_path: Path | None = None
+
+    def __init__(self, version: str, model: str) -> None:
+        self.version = version
+        self.model = model
+        self.url = self._get_download_url()
+
+    def download(
+        self, save_path: Path | None = None, skip_if_exists: bool = True
+    ) -> None:
+        if save_path is None:
+            save_path = self._get_default_save_path()
+
+        self.save_path = save_path
+
+        if save_path.exists() and skip_if_exists:
+            # Skipping
+            return
+
+        # Make sure that all parent directories exist.
+        # If not, create them.
+        save_path.parent.mkdir(parents=True, exist_ok=True)
+
+        click.echo(f"Downloading from {self.url} to {save_path}")
+        with requests.get(self.url, stream=True, timeout=30) as r:
+            r.raise_for_status()
+            with open(save_path, "wb") as f:
+                for chunk in r.iter_content(chunk_size=8192):
+                    f.write(chunk)
+
+    def set_as_executable(self) -> None:
+        if self.save_path is None:
+            raise click.ClickException("Run `download` first")
+
+        path = Path(self.save_path)
+        path.chmod(path.stat().st_mode | stat.S_IXUSR)
+
+    def check_download_availability(self) -> None:
+
+        version_tuple = tuple(int(part) for part in self.version.split("."))
+        if version_tuple < OLDEST_AVAILABLE[gen_from_model(self.model)]:
+            # Is old known-to-be-unavailable version
+            raise KnownMissingArtifactError(self.model, self.version)
+
+        status_code = requests.head(self.url, timeout=10).status_code
+        if status_code != HTTPStatus.OK:
+            # Not available for download
+            raise MissingArtifactError(self.model, self.version)
+
+    def _get_filename(self) -> str:
+        return f"trezor-emu-{gen_from_model(self.model)}-{self.model}-v{self.version}"
+
+    def _get_default_save_path(self) -> Path:
+        return SAVE_DIR / self.model / self._get_filename()
+
+    def _get_download_url(self) -> str:
+        return f"{EMULATORS_URL_PREFIX}/{self.model}/{self._get_filename()}"
+
+
+def get_all_releases() -> EmulatorDict:
+    with RELEASES_JSON.open(encoding="utf-8") as f:
+        releases: dict[str, EmulatorDict] = json.load(f)
+    return releases["firmware"]
+
+
+def get_emulators_for_model(model: str, firmwares: EmulatorDict) -> list[Emulator]:
+    emulators: list[Emulator] = []
+    for version, models in firmwares.items():
+        if model in models:
+            try:
+                emu = Emulator(version, model)
+                emu.check_download_availability()
+                emulators.append(emu)
+            except KnownMissingArtifactError:
+                # Old artifacts that are known to be unavailable
+                pass
+            except MissingArtifactError as e:
+                click.echo(
+                    f"Artifact for model {e.model}, version: {e.version} is unavailable!"
+                )
+    return emulators
+
+
+def download_emulators_for_model(model: str) -> None:
+    if model not in ALL_MODELS:
+        raise ValueError(f"Unknown model: {model}")
+
+    all_releases = get_all_releases()
+    emus = get_emulators_for_model(model, all_releases)
+
+    for emu in emus:
+        emu.download()
+        emu.set_as_executable()
+
+
+@click.command()
+@click.argument("model", type=click.Choice(ALL_MODELS, case_sensitive=True))
+def main(model: str) -> None:
+    """
+    Download all available emulators for a given Trezor model.
+    """
+    download_emulators_for_model(model)
+
+
+if __name__ == "__main__":
+    main()
diff --git a/tests/download_emulators.sh b/tests/download_emulators.sh
index 11744e734..1db5b2d88 100755
--- a/tests/download_emulators.sh
+++ b/tests/download_emulators.sh
@@ -1,24 +1,17 @@
 #!/usr/bin/env bash
 set -e
+if [ $# -lt 1 ]; then
+  echo "Usage: $0 <model>"
+  exit 1
+fi
 
-SITE="https://data.trezor.io/dev/firmware/releases/emulators/"
-cd "$(dirname "$0")"
+MODEL="$1"
 
-# download all emulators without index files, without directories and only if not present
-wget -e robots=off \
-    --no-verbose \
-    --no-clobber \
-    --no-parent \
-    --no-directories \
-    --no-host-directories \
-    --recursive \
-    --reject "index.html*" \
-    --reject "-arm" \
-    -P emulators/ \
-    $SITE
+cd "$(dirname "$0")"
 
-chmod u+x emulators/trezor-emu-*
+# download emulators for the given model if not already present
+uv run python download_emulators.py "$MODEL"
 
 cd ..
 # are we in Nix(OS)?
-command -v nix-shell >/dev/null && nix-shell --run 'NIX_BINTOOLS=$NIX_BINTOOLS_FOR_TARGET autoPatchelf tests/emulators'
+command -v nix-shell >/dev/null && nix-shell --run 'NIX_BINTOOLS=$NIX_BINTOOLS_FOR_TARGET autoPatchelf tests/emulators/$MODEL'