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Lantronix NTC_55x Software
Software Release Notes
Copyright 2026 (c) Lantronix Inc.
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RELEASE SUMMARY
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Version:      3.5.1.0R3
Release Date: Aug 11, 2026

Previous version was 3.5.1.0R1 on Aug 03, 2026

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RELEASE STATUS
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  Alpha        ( )
  Beta         ( )
  Supplemental ( )
  Production   (x)
  Test         ( )

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PRODUCTS SUPPORTED
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NTC_55x
1) ntc_551_3.5.1.0R3_root.signed.star : NTC_551 [md5sum: f2610c8b55c4b261cab42b468bd1118b]
2) ntc_552_3.5.1.0R3_root.signed.star : NTC_552 [md5sum: 84f4b9d284f7aaabe271de68b9c74c9c]

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NEW FEATURES/TASK
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1 . Integrated Pairpoint VPN support for NTC-50x and NTC-55x products: SHK-2977

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Bug Fixes
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1 . Restored SSH access for newly created root users following a firmware upgrade: SHK-3213
2 . Improved WebUI access controls and restrictions for viewer users: SHK-3204, SHK-3166
3 . Corrected UI layout issues on the SMS Inbox and Outbox pages: SHK-3184
4 . Improved SIM PIN configuration and validation behaviour: SHK-3183, SHK-3167
5 . Improved switching time when using a Verizon SIM: SHK-3241

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REMOVED FEATURES
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KNOWN LIMITATIONS & ISSUES
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1) SHK-2638: Additional Features for Percepxion Support of NTC-50x Products
2) SHK-2713: When the account is locked, the user must wait for the default duration of 2 minutes or the time specified in the configuration settings.

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NOTES
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1) Default Configuration (SIM1 & SIM2)
    * APN, Username, and Password fields are left blank by default.
    * APN type: none
    * PDP type: ipv4v6

2) Default CID Settings
    * CID1 is enabled by default, and the default route is configured on this CID for both SIMs.
    * For Verizon or similar SIMs, users must manually enable CID3, set the default route on it, and disable CID1.

3) Perticular-SIM Configuration
    * To modify settings for a specific SIM, switch to that SIM before making changes.

4) SIM Switching Behavior
    * If the external SIM has been removed and user want to change its configuration, turn off the option:
      “Switch to internal SIM if removable SIM is removed.”
    
5) When upgrading from version v1.2.61.0/v1.2.62.0 to v2.0.1.0 /2.0.0.0 R5  or later, the APN, username, password, and authentication type values 
   will not be retained. Only the profile names will be preserved.
   Users are advised to perform a factory reset after the upgrade.

6) To fix issue SHK-2270, default values were added to the Periodic Ping configuration parameters.


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WARNINGS
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