Guoxd Device Tools

Test on your sample.

Hardware results remain pending until you perform and record each test. The owner's earlier successful wired installation and Bluetooth transfer are separate evidence.

Start with files

  1. Back up the device. Enter Bluetooth transfer, connect, and check the returned version and E: free space.
  2. Create a dedicated WEBTEST folder. Upload a new non-sensitive file. Wait for the device read-back SHA-256 match, then download it and compare its hash on your computer.
  3. Test 0, 242, 243, 244, 486 and 487-byte files. Only after these pass, test 64 KiB and 256 KiB if space allows.
  4. Test folders, renaming, remarks and hidden/read-only metadata. Check that existing metadata is retained. Test large directories separately.
  5. Export the session log and record operating system, browser version, sample, file sizes and hashes. Review private filenames and the Bluetooth address before sharing.

MTU remains unknown. A complete 247-byte notification supports only the current session's large-notification capability. Small-transfer success is insufficient.

If an operation stops

Preserve the log. Do not automatically retry a write, rename, delete or format. Re-enter Bluetooth transfer on the device, reconnect, and inspect the actual files. The new session sends CLOSE(0) before new file operations. A partial or truncated file may remain; cancellation does not restore the old file.

If the device is unresponsive and no normal write or update is active, disconnect all external cables, switch OFF, wait a few seconds, switch ON and retry the connection. This does not guarantee storage repair. Use your existing SWD recovery instructions if necessary.

Firmware test

  1. Use only your confirmed LCD sample already fully flashed with Guoxd_r1. Back up external files, metadata, settings and important tag state.
  2. Have the original wired recovery package, correct verified wiring and working SWD equipment ready. Charge the device and keep power stable.
  3. Select the exact signed candidate from the engineering handoff. Confirm all three test-scope statements. Connect in normal mode and click Enter DFU.
  4. After the entry ACK and disconnect, click Select DFU device. Choose your own Guoxd dfu sample. Do not interrupt the object transfer.
  5. Preserve the log. Re-enter normal Bluetooth transfer, reconnect and check the version, device controls, files, hashes, favorites and settings. The version stays 2.16.1-c1; the same version or 100% progress alone cannot prove installation.

If interrupted, do not assume rollback. Resume is allowed only with matching candidate prefix CRC and offset. An ambiguous object boundary is rejected; follow the engineering recovery plan. No production approval is implied.

Formatting is skipped by default

Format only a dedicated, fully backed-up sample that may lose all external data, with a separate explicit confirmation. Formatting clears the entire E: filesystem, potentially including settings and favorites. A test folder cannot isolate its effect.