diff --git a/usb_config.md b/usb_config.md
index 6150774..89fae3f 100644
--- a/usb_config.md
+++ b/usb_config.md
@@ -39,6 +39,98 @@ meshtastic_legacy_admin="true"
dont_run_if_log_exists="true"
```
+> \[!NOTE\]
+> Enter as many or as few settings as you like.
+>
+> For `wifi_country`, insert your country's [ISO/IEC alpha2 two letter country code](https://en.wikipedia.org/wiki/ISO_3166-1_alpha-2#Officially_assigned_code_elements) (such as US, GB, DE, IN, etc.) in capital letters.
+>
+> Use a timezone as it appears in [the tz database](https://en.wikipedia.org/wiki/List_of_tz_database_time_zones).
+>
+> **Meshtastic**
+> For `meshtastic_lora_radio`, choose your radio from the supported hardware list.
+> Options are:
+>
+> - `ebyte-e22-900m30s`
+> - `ebyte-e22-900m22s`
+> - `ebyte-e80-900m22s` _(experimental)_
+> - `heltec-ht-ra62`
+> - `seeed-wio-sx1262`
+> - `waveshare-sx126x-xxxm`
+> - `ai-thinker-ra-01sh`
+> - `sx1262_tcxo` _(for Ebyte E22-900M30SM, Ebyte E22-900M22S, Heltec HT-RA62, Seeed Wio SX1262)_
+> - `sx1262_xtal` _(for AiThinker RA01SH, and Waveshare Pi hat)_
+> - `lr1121_tcxo` _(experimental, for Ebyte E80-900M2213S)_
+> - `none` _(for simulated radio)_
+>
+> Clearing the `meshtastic_admin_key` list: The admin key list can contain up to three keys - _if more are added they will be ignored_. The USB configuration tool supports clearing the admin key list, after which you will need to re-add your admin key/s in a second operation. To clear the admin key list, enter `meshtastic_admin_key="clear"`.
+
+> \[!NOTE\]
+> `dont_run_if_log_exists="true"` will prevent the USB configuration tool from working if there's a log present on the USB drive, indicating it has already been run. There is also an LED boot code for this, described below.
+
+**To apply your configuration, reboot the Femtofox with the USB drive plugged in, or run `sudo femto-config` -> `Utilites` -> `Run USB configuration tool`. No other USB drives can be plugged in at the same time.**
+A log (`femtofox-config.log`) is saved to `/home/femto` and the USB drive (except on NTFS, which is read only).
+
+
+### Boot codes
+
+When the Femtofox is finished booting, it will blink its User LED (see below) in a pattern which can be used to gather info on its status or help diagnose issues.
+
+
+
+| LED blink pattern | Meaning | Possible causes | Solutions |
+| ------------------------------------------------------------------------------------------------------------------------------------------------------------------ | ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- | ---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |
+| ⚠️
\_______________\_
1 very long blink, lasting 5 seconds | Failed to mount USB drive. Ignoring. | Invalid filesystemCorrupted partition tableDefective USB driveDefective USB OTG adapter | Use a supported partition (FAT32, exFAT, NTFS, ext4)Repair partition tableTry another USB driveTry another USB OTG adapter |
+| ⚠️
\____\_ \____\_
2 long blinks, each lasting 1.5 seconds | femtofox-config.txt is configured to skip if log exists. | USB drive mounted successfully but femtofox-config.txt contains `dont_run_if_log_exists="true"` and a log is present on the USB drive. Ignoring. | Remove log from USB drive or remove `dont_run_if_log_exists` line from femtofox-config.txt |
+| ⚠️
\____\_ \____\_ \____\_
3 long blinks, each lasting 1.5 seconds | USB drive mounted successfully but femtofox-config.txt was not found. Ignoring. | Config file missing. | Create configuration file as described above. |
+| ⚠️
\____\_ \____\_ \____\_ \____\_ \____\_
5 long blinks, each lasting 1.5 seconds | USB drive mounted successfully and femtofox-config.txt was found but did not contain readable configuration data. Ignoring. | Configuration file improperly formatted or contains no data. | Check configuration file contents as described above. |
+| ⚠️
\__\_ \__\_ \_ \_ \__\_ \__\_ \_ \_
2 long blinks, each lasting 1 second, then 2 short blinks, each lasting 1/4 of a second. Repeats twice | Error while trying to implement a Meshtastic setting after 3 attempts. Some settings may have been implemented successfully. | The error may be transient.Configuration file may contain improper data. | Try again.Check configuration file contents as described above.Check the log.
This pattern may flash before other patterns. The pattern will repeat once for each failed setting. |
+| ✅
. . . . . . . . . .
10 very fast blinks, each lasting 1/8th of a second | USB drive mounted successfully, and femtofox-config.txt was found and contained configuration data which was sent for deployment. Any affected services will now restart. You can disconnect the USB drive. | This does not mean that the information in the config file is correct - only that it was readable.
Note that the "success" boot code will flash if at least one setting is successfully read - even if the setting was not implemented successfully. | |
+| ✅
\_\_ \_\_ \_\_ \_\_ \_\_
5 medium blinks, each lasting 0.5 seconds | Boot complete. Appears on every successful boot and always appears last. | | |
+
+> \[!NOTE\]
+> Boot codes can appear in sequence - for example: one long (4 second) blink, followed by 5 medium (half second) blinks means the USB drive failed to mount, and that the boot sequence is complete.
+
+## USB Configuration Tool
+
+To configure some Femtofox settings such as wifi, you can insert a USB flash drive containing a configuration file. On boot, the system will automatically recognize, mount and implement the settings you specify. The tool can also be run from the `femto-config` tool, in the `Utilities` menu.
+
+Configurable settings are:
+
+- Wifi SSID
+- Wifi PSK (password)
+- Wifi country
+- Timezone
+- Activity LED (blinky light - disable for minor power savings)
+- Meshtastic:
+ - LoRa radio model
+ - [URL](https://meshtastic.org/docs/software/python/cli/#--seturl-seturl) (used to configure LoRa settings and channels)
+ - Security: public key
+ - Security: private key
+ - Security: Add Admin Key
+ - Security: Clear Admin Key List
+ - Security: [Legacy Admin Channel](https://meshtastic.org/docs/configuration/radio/security/#admin-channel-enabled) enable/disable
+
+### Instructions
+
+The USB drive must be formatted with a single FAT32, exFAT, NTFS (read only - log will not be saved to drive) or ext4 partition. Add a file named `femtofox-config.txt` and whichever settings you would like to change (CaSe sEnSiTiVe).
+
+ [**Get an example USB configuration file here**](assets/femtofox-config.txt)
+
+```
+wifi_ssid="Your SSID name"
+wifi_psk="wifipassword"
+wifi_country="US"
+timezone="America/New_York"
+act_led="enable"
+meshtastic_lora_radio="ebyte-e22-900m30s"
+meshtastic_url="https://meshtastic.org/e/#CgMSAQESCAgBOAFAA0gB"
+#meshtastic_public_key="XX="
+#meshtastic_private_key="XX="
+meshtastic_admin_key="XX="
+meshtastic_legacy_admin="true"
+dont_run_if_log_exists="true"
+```
+
> \[!NOTE\]
> Enter as many or as few settings as you like.
>