diff --git a/readme.md b/readme.md
index 69769ba..3fccacc 100644
--- a/readme.md
+++ b/readme.md
@@ -83,6 +83,8 @@ Dashboard — mobile (390 px) and desktop (1280 px):
 | Raspberry Pi 3 Model B Rev 1.2 | Web UI host, logger, uploader, and WiFi hotspot |
 | Waveshare SIM868 HAT | GNSS (GPS) + optional GSM/GPRS uplink, unused Bluetooth |
 | USB OBD-II adapter | PL2303-based, ELM327-compatible (originally Bluetooth, switched to USB) |
+| DS3231 RTC module | Battery-backed real-time clock on I²C (`i2c-1`, 0x68) — keeps trip timestamps correct with no internet |
+| Power | Regulated 5V hard-wired to GPIO pins 2 & 6 (red/black), fed from a fused 12V→5V source — bypasses the worn micro-USB port |
 | 2× TP-Link Archer T3U (RTL8812BU) | USB WiFi dongles — AC1300 dual-band. wlan1 hosts the 5GHz in-car AP; wlan2 carries the internet uplink since 2026-08-14 |
 | Onboard BCM43438 (wlan0) | Fallback only — was the internet uplink until 2026-08-14 |
 | USB dashcam | Any brand — detected as generic USB mass storage |
@@ -109,78 +111,6 @@ including the one-shot `deploy/auto_install.sh` installer — use
 
 For the remote server (receives trip logs + dashcam uploads), see [server/README.md](./server/README.md).
 
-## Customizing device identity
-
-The Pi displays an owner name, car model, device name, and avatar. You can manage those values in
-two ways:
-
-- **Locally on the Pi** through the Settings page
-- **From the server portal** when **Sync with server** is enabled on the Pi
-
-The local fallback/default source remains [config/device.json](./config/device.json), so the car
-still boots with sensible identity values even when fully offline.
-
-### Edit device configuration
-
-Edit [config/device.json](./config/device.json):
-
-```json
-{
-  "owner_name": "quoije",
-  "car_model": "Yaris 2013",
-  "device_name": "Yaris OBD",
-  "avatar_path": "img/yaris.png"
-}
-```
-
-| Field | Location | Purpose |
-|-------|----------|---------|
-| `owner_name` | Top-right of app topbar | Your name/username |
-| `car_model` | Left sidebar (next to car icon) | Vehicle model/year |
-| `device_name` | Local settings / remote portal | Device identity used by server sync/provisioning |
-| `avatar_path` | Top-right avatar circle | Profile picture (relative to `static/`) |
-
-If you edit the JSON file directly, restart the app:
-
-```bash
-# If running as a systemd service:
-sudo systemctl restart yaris-obd.service
-
-# If running manually:
-# Ctrl+C and python3 app.py
-```
-
-### Changing the profile picture
-
-Option 1: Replace the default image file:
-```bash
-cp /path/to/your/image.png static/img/yaris.png
-```
-
-Option 2: Add your image to `static/img/` and update `avatar_path`:
-```json
-{
-  "avatar_path": "img/my-avatar.png"
-}
-```
-
-### Important: Username and database filename
-
-The local SQLite database filename is based on `owner_name`: `db/sql/<owner_name>_<car_model>.db` (via [modules/app_sql.py](./modules/app_sql.py)).
-
-If you **change `owner_name`** and already have trip data:
-- The app will create a **new database** with the new name
-- Your old database remains at `db/sql/quoije_Yaris2013.db` (orphaned)
-
-To preserve your data:
-```bash
-# Option 1: Rename the database file
-mv db/sql/quoije_Yaris2013.db "db/sql/YourName_YourCar.db"
-
-# Option 2: Start fresh
-rm db/sql/quoije_Yaris2013.db
-```
-
 ## Project status
 
 The Pi app, remote server, device sync, and the Android companion app are all implemented and