SB3 / SB3a / SB5 Upgrade Chip, 1.65B (5240403)

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NCE: SB3 / SB3a / SB5 Upgrade Chip, 1.65B (5240403)

Summary: Upgrade any SB3, SB3a, or SB5 to the most recent firmware version.

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General information
DCC Category
Manufacturer NCE
MSRP 32.95 USD33.54 EUR <br />29.35 GBP <br />49.80 AUD <br />44.45 CAD <br />
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Manufacturer Part Number
Common Name SB3 / SB3a / SB5 Upgrade Chip, 1.65B
UPC Number
Release information

Product URL External Product Link
Product Manual URL External Product Link
Has computer interface
Firmware Upgrade Possible
Misc Details


This is an upgraded ROM for the Power Cab's companion Smart Booster series.

Unless there is a problem which cannot be solved, or there are not more than three NCE Devices in use and the Smart Booster is version 1.65, upgrading to the B version is unnecessary.

New features in version 1.65B

  1. All throttles now have up to 6 recalls
  2. Support for 6 external throttles using Cab Addresses 2, 3, 4, 5, 6, and 7
  3. Support for 3 cab bus devices such as the AIU, USB or Mini-Panels in addition to the extra throttles. Using Cab Address 8, 9, and 10
  4. New thumbwheel control of CV programming values
  5. Easy memory operation of the last thrown turnout
  6. Support for Analog Fast Clocks
  7. New and improved USB/computer commands

1.65B fixes a bug for some users who lose cab addresses 5, 8, 9, 10 after a command station reset.

Determine the Firmware Version of a Smart Booster

From the regular loco screen on the cab:

  1. Press Prog/Esc four times to get to "Set Cmd Station"
  2. Press Enter

The first thing displayed is the command station version: 1.65 or 1.65B. That is the most recent major versions.

Press Prog/Esc twice to get back to the regular screen

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