Fnirsi-138 Pro Firmware Update Jun 2026

Here’s a clear, step-by-step write-up for updating the firmware on the (a popular multifunction signal generator / scope / counter).

New (toy?) DSO, Fnirsi-138 Pro: 2.5MS/s, 2.4" screen - EEVblog

Turn on the FNIRSI-138 Pro. Navigate to the "System" menu (usually the gear icon at the top right). Look for "System Info" or "About." Write down the current version number (e.g., V1.0.2, V1.1.0). Download the newer version specifically for your region (Chinese vs International models have different bootloaders). fnirsi-138 pro firmware update

Download the latest .bin or .hex file from the FNIRSI Official Download Page or verified manufacturer links. Step-by-Step Update Guide Follow these steps to safely flash your device: EEVbloghttps://www.eevblog.com

: If you experience waveform issues after an update, you may need to perform an automatic calibration by unplugging the probe and pressing the [AUTO] key. Here’s a clear, step-by-step write-up for updating the

After the update, navigate back to System Info. Confirm the version number has changed. Then, run a quick sanity check:

| Issue | Likely Fix | |-------|-------------| | Device not detected in DFU mode | Try another USB port/cable, reinstall drivers, or restart PC. | | Update fails at 50% | Battery low? Charge device or keep USB power stable. | | Screen stays black after update | Re-run update; if stuck, contact FNIRSI support for recovery image. | Look for "System Info" or "About

Common reasons to update include:

: It is strictly forbidden to drag any files other than the officially released firmware into the U-disk mode, as this can cause irreversible damage to the device. Calibration