feat(core): show confirmation dialog before rebooting

core/src/apps/management/reboot_to_bootloader.py

@@ -1,7 +1,8 @@
 from typing import TYPE_CHECKING
 
-from trezor import utils, wire
+from trezor import io, loop, utils, wire
 from trezor.messages import RebootToBootloader, Success
+from trezor.ui.layouts import confirm_action
 
 if TYPE_CHECKING:
     from typing import NoReturn
@@ -10,8 +11,16 @@ if TYPE_CHECKING:
 
 
 async def reboot_to_bootloader(ctx: wire.Context, msg: RebootToBootloader) -> NoReturn:
-    await ctx.write(Success())
-    # writing synchronously twice makes USB flush properly before reboot
-    await ctx.write(Success())
+    await confirm_action(
+        ctx,
+        "reboot",
+        "Go to bootloader",
+        "Do you want to restart Trezor in bootloader mode?",
+        hold_danger=True,
+        verb="Restart",
+    )
+    await ctx.write(Success(message="Rebooting"))
+    # make sure the outgoing USB buffer is flushed
+    await loop.wait(ctx.iface.iface_num() | io.POLL_WRITE)
     utils.reboot_to_bootloader()
     raise RuntimeError