diff --git a/README.md b/README.md
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+++ b/README.md
@@ -8,28 +8,40 @@ Use this tool to install your initial WiFiCom files or to update an existing WiF
 - MacOS Sonoma before 14.4 corrupts files on CIRCUITPY drives! Put your WiFiCom in Drive Mode first, then use the workaround on [this page](https://learn.adafruit.com/welcome-to-circuitpython/troubleshooting) before running `wificom-update-tool`.
 
 ## Updating
+- See the bottom section if any of these steps look different on your device!
 - Back up the files on your CIRCUITPY drive if you changed anything important. This tool aims to preserve previous WiFiCom config and only delete/overwrite specific files, but be cautious about any files you don't want to lose.
-- Put your WiFiCom into Drive Mode using the menu.
-  - If you cannot do this (because it is a screenless unit, or because something has gone wrong), then use Dev Mode instead: connect the WiFiCom to USB while holding the C button (the only button on screenless units) then release the button promptly when the LED comes on.
+- Put the WiFiCom into Drive Mode using the menu.
 - Run the update tool and select an option.
 - If a CircuitPython upgrade/downgrade is recommended, the tool will link to the appropriate file.
   - Choose "Download UF2 file" to save the file using your web browser.
   - Eject (safely remove) the CIRCUITPY drive from your computer.
-  - Put the unit into bootloader mode:
-    - On Pi Pico W, disconnect the USB / power supply, and reconnect while holding the BOOT button.
-      - On Xanthos's premade units, the BOOT button is on the back. You may need a tool to press it.
-    - On Arduino Nano RP2040 Connect, double-click the RESET button.
+  - Exit Drive Mode by holding the C button.
+  - Put the unit into bootloader mode using the option in the Settings menu.
   - Copy the UF2 file into the RPI-RP2 drive that appears.
-  - Re-run the update tool and select the same option as before.
+  - When the WiFiCom has rebooted, put it back into drive mode, and re-run the update tool with the same option as before.
 - Wait for the update to complete.
 - Eject (safely remove) the CIRCUITPY drive from your computer.
-- If the WiFiCom is in "Drive Mode", select another option from the menu. If it is a screenless unit or in "Dev Mode", disconnect and reconnect the USB / power supply, or press the RESET button once if you have one.
+- Exit Drive Mode by holding the C button.
 
 ## Installing on a new build
-- Install the appropriate version of CircuitPython (see [wificom-lib](https://github.com/mechawrench/wificom-lib)) using the instructions above. On a fresh board, the RPI-RP2 drive appears by default.
+- Install the appropriate version of CircuitPython (see [wificom-lib](https://github.com/mechawrench/wificom-lib)). On a fresh board, the RPI-RP2 drive appears by default. Otherwise, enter bootloader mode using the instructions below.
 - If you are using a custom circuit layout, modify "board_config.py" from wificom-lib and save it to your CIRCUITPY drive.
 - Run the update tool and select an option.
 - Wait for the installation to complete.
 - Create a new WiFiCom on https://wificom.dev/ and follow the "Credentials Download" instructions on the page that appears.
 - Eject (safely remove) the CIRCUITPY drive from your computer.
-- Disconnect and reconnect the USB / power supply, or press the RESET button once if you have one.
+- Disconnect and reconnect the USB / power supply.
+
+## Exceptions (P-Com, older versions, non-bootable)
+### Making the CIRCUITPY drive writeable
+- WiFiCom Dev Mode: connect the unit to USB while holding the C button (or the only button) then release the button promptly when the LED comes on.
+- P-Com with no LED: connect the unit to USB while holding the main button, and keep holding until the CIRCUITPY drive appears.
+### Rebooting into normal mode (make CIRCUITPY read-only again)
+- **First** eject (safely remove) the CIRCUITPY drive from your computer.
+- Older WiFiCom firmware in "Drive Mode": select a different mode from the menu.
+- Screenless units / WiFiCom in "Dev Mode" / not running: disconnect and reconnect the USB / power supply.
+- Arduino Nano RP2040 Connect: press the RESET button once.
+### Bootloader mode
+- Most boards: disconnect the USB / power supply, reconnect while holding the BOOT button, and keep holding until the RPI-RP2 drive appears.
+- Xanthos's premade units: the BOOT button is on the back. On battery units you will need to detach the battery module. You may need a tool to press the button.
+- Arduino Nano RP2040 Connect: double-click the RESET button.