微電腦 - King Jim Pomera DM250 - 如何備份NAND Flash

參考資訊：
https://www.ekesete.net/log/?p=9504
https://haruka.cafe/posts/it/p000157/
https://qiita.com/alt-core/items/0467dca2f4b50d3e3003

步驟如下：
1. https://github.com/steward-fu/website/releases/download/dm250/DM200_DM250_emmc_backup_restore_v0.2.zip
2. 格式化SD卡成FAT32
3. 將DM200_DM250_emmc_backup_restore_v0.2/backup/裡面的檔案複製到SD卡根目錄
4. 按下電源按鍵 + 左Alt + 右Shift