OreBolt-OS/overlay/data/stock_backup

# Stock Firmware Backup Convention

## Purpose

OreBolt OS and the stock Hiby Player firmware both boot from the
FAT32 MicroSD card.  The SPI flash bootloader is never modified.
This directory holds a snapshot of the stock firmware so the System
Tools module can restore the device to its factory state.

## How the backup is created

On the **first deployment only**, run:

```bash
SD_CARD_MOUNT=/mnt/h2-sd ./build.sh --deploy --backup-stock
```

This snapshots the following paths from the stock SD card into this
directory, before any OreBolt OS files are written:

```
data/stock_backup/
  usr/bin/          Stock binaries (including hiby_player)
  usr/lib/          Stock shared libraries
  etc/inittab       Stock init configuration
  etc/init.d/       Stock init scripts
  res/              Stock resources (fonts, themes, assets)
  setting/          Stock player settings and database
```

## How the restore works

The System Tools module (reset.mod) reads from this directory when
the operator selects "HIBY PLAYER -- Restore stock FW":

1. Stops all OreBolt OS init scripts (S98retro-input, S99broker, bt_input_daemon)
2. Removes /apps/*.mod (all module binaries)
3. Removes /usr/bin/h2_test and /usr/bin/retro_input_mapper
4. Removes OreBolt init scripts from /etc/init.d/
5. Removes /usr/lib/liblvgl.so
6. Restores stock files from /data/stock_backup/ back to their
   original locations (/usr/bin/, /usr/lib/, /etc/, /res/, /setting/)
7. Calls sync() and reboots

After reboot, the device loads the original Hiby Player -- the music
player that shipped from the factory.

## User-installed Rockbox

OreBolt OS does not ship, bundle, or install Rockbox.  If the user
has installed Rockbox on the SD card independently, the System Tools
module detects its presence (`.rockbox/` or `rockbox/` at the SD card
root) and offers a reboot option.  No OreBolt OS files are modified
when booting to Rockbox -- a reboot is sufficient for the user's
Rockbox installation to load.