What is the TN1700 OTDR SD card bug?

The bug prevents the OTDR from correctly reading or writing SOR files to the SD card when inserted.

How can I fix the TN1700 OTDR SD card read/write bug?

You can fix this bug by upgrading your OTDR using the provided upgrade package.

Which TN1700 OTDR devices are affected by this bug?

This bug specifically affects TN1700 OTDRs manufactured before 30 April, 2025.

What are the steps to upgrade my TN1700 OTDR?

1. Unzip the upgrade package. 2. Copy and paste it to the root of your SD card. 3. Click "upgrade" within the OTDR's menu.

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How to fix TN1700 OTDR SD Card Read Bug

August 28, 2026August 27, 2026 by Eric Yang - Technical Support

When users insert their SD card, the OTDR can not read it correctly or users can not write sor files to the SD card. To solve the bug, please upgrade your OTDR by the upgrade package.
* The bug only comes with OTDRs manufactured before 30 April, 2025
1. unzip the upgrade package.
2. copy and past it to the root of your SD card
3. click “upgrade” in OTDR

Eric Yang — Senior Technical Support Engineer

Eric specializes in PON network testing, OTDR diagnostics, and optical fiber monitoring solutions at FirstFiber Technologies.
✉️ Email: tech@firstfibertech.com

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Eric Yang — Senior Technical Support Engineer

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