docs: make two-button boot mode impossible to misread

Customer feedback: a Starter Kit owner watched the boot-mode clip, saw a
finger resting on the board and a second finger pressing reset, and
pressed reset alone. The clip started with boot already held and never
said so.

- Every page that enters boot mode with boot plus reset (25 pages,
  Home Assistant and Homey) now lists the order as three bullets (hold
  boot; while still holding it, press and release reset; let go of
  boot) and a "Keep holding boot the whole time" warning that reset
  alone only restarts the device, placed before the photo or clip.
  Method intros lead with holding boot instead of "use both together".
- The five boot-mode clips (Starter Kit, BTN-1, CAST-1, H-2, PUMP-1)
  now have a step caption bar ("1 Press and hold BOOT", "2 Keep holding
  BOOT. Tap RESET.", "3 Let go of BOOT", "Boot mode is on") that changes
  with the action, a pause at the start of each step so it can be read,
  and alt text that describes the captions. The three largest are also
  smaller (5.2 MB to 2.5 MB, 4.7 to 1.7, 2.7 to 1.7).
- R PRO-1 Method 2 now plugs the board back in before the buttons
  (step 1 unplugged it and nothing reconnected it).
- BTN-1 boot-mode step numbers fixed (1, 2, 4 and 1, 2, 2, 3).
- Style guide: the pattern for two-button boot mode.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

Author: Bunton33

STYLE_GUIDE.md

@@ -172,6 +172,16 @@ where the Apollo installer has no equivalent: TEMP-1 Revision 1
 firmware. The LED-1 uses the official WLED installer at
 `https://install.wled.me/`.
 
+**Boot mode with two buttons.** When a step uses both the boot and reset
+buttons, write the order as three bullets (press and hold **boot**; while
+still holding it, press and release **reset**; let go of **boot**), then a
+`warning` admonition titled "Keep holding boot the whole time" that says
+pressing **reset** alone only restarts the device. Put both before the
+photo or clip. Clips of the sequence carry step captions ("1 Press and hold
+BOOT", "2 Keep holding BOOT. Tap RESET.", "3 Let go of BOOT") so a reader
+who only watches still holds boot. A customer once watched an uncaptioned
+clip, saw a finger resting on the board, and pressed reset alone.
+
 ---
 
 ## 6. Voice and structure

docs/assets/btn-1-boot-mode-method-2.webp

@@ -21,13 +21,21 @@ You'll hold the boot button while you plug in the USB-C cable, so the device sta
 
 ## Method 2: Boot and reset buttons
 
-You'll use the boot and reset buttons together to put the device into boot mode while it's plugged into your computer.
+You'll plug the device into your computer, then hold the boot button down while you press and release the reset button.
 
 1\. Unplug the device and locate the boot and reset buttons as shown in the image below.
 
 2\. Plug it into your computer.
 
-3\. Hold down the boot button, then press and release the reset button while keeping the boot button pressed. Finally, release the boot button.
+3\. Put your AIR-1 in boot mode. Use both buttons, in this order:
+
+- Press and hold the **boot** button (the right button, next to the USB-C port). Keep holding it.
+- While you're still holding **boot**, press and release the **reset** button (the left button).
+- Let go of **boot**.
+
+!!! warning "Keep holding boot the whole time"
+
+    Pressing **reset** by itself only restarts the AIR-1. It goes into boot mode only when **boot** is held down while you press and release **reset**.
 
 ![AIR-1 reset and boot buttons boxed and labeled with arrows next to the USB-C port](/assets/air-1-reset-boot-buttons-arrows.jpg)
 

docs/assets/cast-1-boot-mode-method-2.webp

@@ -22,13 +22,21 @@ You'll hold the boot button while you plug in the USB-C cable.
 
 ## Method 2: Boot and reset buttons
 
-You'll use the boot and reset buttons together while the device is plugged into your computer.
+You'll plug the device into your computer, then hold the boot button down while you press and release the reset button.
 
 1\. Unplug the device and locate the boot button (the right opening, shown in the image above) and the reset button (the left opening, shown in the image below).
 
 2\. Plug it into your computer.
 
-3\. Hold down the boot button (the right button), then press and release the reset button (the left button) while keeping the boot button pressed. Finally, release the boot button.
+3\. Put your MSR-2 in boot mode. Use both buttons, in this order:
+
+- Press and hold the **boot** button (the right button). Keep holding it.
+- While you're still holding **boot**, press and release the **reset** button (the left button).
+- Let go of **boot**.
+
+!!! warning "Keep holding boot the whole time"
+
+    Pressing **reset** by itself only restarts the MSR-2. It goes into boot mode only when **boot** is held down while you press and release **reset**.
 
 ![MSR-2 case side with a tool pointing at the left opening for the reset button](/assets/msr-2-reset-button.jpg)
 

docs/assets/esphome-starter-kit-boot-mode.webp

@@ -22,13 +22,21 @@ You'll hold the boot button while you plug in the USB-C cable.
 
 ## Method 2: Boot and reset buttons
 
-You'll use the boot and reset buttons together while the device is plugged into your computer.
+You'll plug the device into your computer, then hold the boot button down while you press and release the reset button.
 
 1\. Unplug the device and locate the boot button (the right opening, shown in the image above) and the reset button (the left opening, shown in the image below).
 
 2\. Plug it into your computer.
 
-3\. Hold down the boot button (the right button), then press and release the reset button (the left button) while keeping the boot button pressed. Finally, release the boot button.
+3\. Put your MTR-1 in boot mode. Use both buttons, in this order:
+
+- Press and hold the **boot** button (the right button). Keep holding it.
+- While you're still holding **boot**, press and release the **reset** button (the left button).
+- Let go of **boot**.
+
+!!! warning "Keep holding boot the whole time"
+
+    Pressing **reset** by itself only restarts the MTR-1. It goes into boot mode only when **boot** is held down while you press and release **reset**.
 
 ![Tool pointing to the reset button opening on the side of the MTR-1 case](/assets/mtr-1-reset-button.jpg)
 

docs/assets/h-2-boot-mode-method-2-boot-reset-buttons.webp

@@ -22,13 +22,21 @@ You can put your device into boot mode with only the boot button and a USB-C cab
 
 ## Method 2: Boot and reset buttons
 
-You can also put your device into boot mode by pressing the reset button while you hold the boot button.
+You can also put your device into boot mode by holding the boot button down while you press and release the reset button.
 
 1\. Unplug the device and locate the boot button (on the side, shown in the image above) and the reset button (near the USB-C port, shown in the image below).
 
 2\. Plug it into your computer.
 
-3\. Hold down the boot button, then press and release the reset button while keeping the boot button pressed. Finally, release the boot button.
+3\. Put your PLT-1 in boot mode. Use both buttons, in this order:
+
+- Press and hold the **boot** button (on the side, shown in the image above). Keep holding it.
+- While you're still holding **boot**, press and release the **reset** button (near the USB-C port, shown in the image below).
+- Let go of **boot**.
+
+!!! warning "Keep holding boot the whole time"
+
+    Pressing **reset** by itself only restarts the PLT-1. It goes into boot mode only when **boot** is held down while you press and release **reset**.
 
 ![Top of the PLT-1 with the reset button circled next to the plugged in USB-C cable](/assets/screenshot-2024-10-23-at-12-35-01-pm.png)