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Firmware · 2025-12-20

Uniden SDS200 firmware 1.24.00 main

Verified — manufacturer file

Download zip (2.1 MB) Manufacturer's page ↗

Main firmware 1.24.00 (20 December 2025). It fixed recognition of P25 Integrated Voice & Data control channels, a click in P25 Conventional mode when LINK is shown, ProVoice reception, control-channel handoff, and muting at volume 0 on channels with a positive volume offset.

Read before installing. Posted by Uniden on 27 March 2026, when 1.26.01 was released, for stepping back from 1.26.01. Contains no sub firmware; the scanner keeps sub 1.03.15.
Product
SDS200 firmware
Version
1.24.00 main
Released
2025-12-20
Runs on
Any PC that can copy files to a USB mass-storage device (Uniden's steps use Windows Explorer)
Applies to
Uniden SDS200
Zip SHA-256
7c2b160fa05067826b12329adb636104e7f0eae3778efaeac1e93bf034e0fd9d

Contents

FileSizeSHA-256
SDS200_V1.24.00_Main.zip2.1 MBc97191fdd1bf792ab8f5fe28e174a2e3543618db531af5a33ceae73b8f92456f
README.txtThese instructions
SHA256SUMSChecksums of the files above

Instructions

The complete README.txt included in the zip:

Uniden SDS200 firmware 1.24.00 main
===================================

WHAT THIS IS
Main firmware 1.24.00 (20 December 2025). It fixed recognition of P25
Integrated Voice & Data control channels, a click in P25 Conventional mode
when LINK is shown, ProVoice reception, control-channel handoff, and muting at
volume 0 on channels with a positive volume offset.

IMPORTANT: Posted by Uniden on 27 March 2026, when 1.26.01 was released, for
stepping back from 1.26.01. Contains no sub firmware; the scanner keeps sub
1.03.15.

Uniden normally delivers firmware only through Sentinel (UPDATE -> Update
Firmware), which always installs the newest version. Uniden published this
package on its change-log page so that owners can install this specific
version by hand - in practice, to go back to it. To bring a scanner up to
date, use Sentinel instead.

APPLIES TO
The Uniden SDS200 (US model) only. Every firmware file carries the model name
(SDS200_...). Do not use it on the SDS100, SDS150, BCD436HP or BCD536HP. The
European SDS200E uses separately named firmware files (e.g.
SDS200E_V1_23_09.bin, per RadioReference owners) and must not be given these
files.

BEFORE STARTING
  - A Windows PC. Uniden's instructions use Windows Explorer; the scanner
    appears as an ordinary removable disk.
  - The supplied USB cable, in the mini-USB port on the scanner's front panel.
  - The SDS200's power supply connected for the whole update. (Some of
    Uniden's SDS200 readmes say "make sure the battery is fully charged"; the
    SDS200 has no battery, so this is carried over from the SDS100 text.)
  - A backup: copy the whole microSD card to the PC and save the Favorites
    Lists in Sentinel first (Uniden's readme asks for both).
  - Sub firmware 1.03.15 already on the scanner. Check under Menu -> Settings
    -> See Scanner Information -> Firmware Version. If the sub is older,
    update with Sentinel instead.

CONTENTS OF THIS ZIP
The download zip holds the vendor file exactly as Uniden published it, plus
this README.txt and SHA256SUMS.

  SDS200_V1.24.00_Main.zip  (2164629 bytes)
    SHA-256 c97191fdd1bf792ab8f5fe28e174a2e3543618db531af5a33ceae73b8f92456f

  Inside SDS200_V1.24.00_Main.zip:
    SDS200_V1_24_00 Main/Readme SDS200 V1_24_00.txt
      Uniden's own instructions (downgrade to 1.24.00)
      2056 bytes
      SHA-256 1f822ccd59c1bb02bd5cf2886b1235e199668a35487ad814b4591f9c6e17980f
    SDS200_V1_24_00 Main/SDS200_V1_24_00.bin
      main (CPU) firmware 1.24.00
      2162688 bytes
      SHA-256 c4f9b8c9074aa273714f3831090cea785817617c487cf43a673fdcb5409f7752

INSTALLATION
  1. Turn the scanner on.
  2. Connect it to the PC with the USB cable. The scanner shows "USB Cable
     Detected / Select USB mode" with "Mass Storage = E" and "Serial Port =
     .".
  3. Press E (Yes) to choose Mass Storage. The scanner shows "USB Mass
     Storage".
  4. In Windows Explorer, open the new removable disk, then the "BCDx36HP"
     folder, then its "firmware" folder. It already holds CitiTable_V00_00.dat
     and ZipTable_V00_00.dat - do not touch or delete them.
  5. Unzip the download on the PC and copy SDS200_V1_24_00.bin into the
     "firmware" folder. Only one main (.bin) and one sub (.firm) file may be
     in the folder at a time; with several versions present the update will
     not start or will load incorrectly.
  6. Restart the scanner ("reset the power", in Uniden's words). The update
     starts automatically as it boots. Do not turn the scanner off until the
     update has finished.
  7. When it has finished, the scanner deletes the firmware file(s) from the
     "firmware" folder by itself.

VERIFYING
Menu -> Settings -> See Scanner Information -> Firmware Version shows the main
and sub versions now installed. The firmware file(s) will also have gone from
the card's "firmware" folder.

IF SOMETHING GOES WRONG
  - Update did not start: check that only one main and one sub file are in the
    "firmware" folder and that the file names are exactly as supplied.
  - Scanner will not start properly after files were deleted from the
    "firmware" folder: the two .dat files were probably removed. Uniden's
    remedy is Sentinel -> Clear User Data, which rebuilds the card but erases
    all user data (hence the backup).
  - USB connection fails or is slow: take the microSD card out and use a card
    reader; Sentinel can work on the card directly (see Vol 5 on this site).
    The same folder layout applies.
  - Card errors: back up what is readable, format the card with the SD
    Association's SD Memory Card Formatter (cards up to 32 GB), run Sentinel
    -> Clear User Data, then Update Firmware.
  - Uniden does not document a recovery procedure for an update interrupted by
    power loss; this could not be confirmed from any source. Uniden's readme
    closes with "Please use these files on your risk."

DOWNGRADING
This package exists for going back: Uniden's readme covers moving from
1.26.01, with the sub staying at 1.03.15. To return to the current version
afterwards, run Sentinel -> UPDATE -> Update Firmware.

PROVENANCE
  - Official source:
    https://info.uniden.com/twiki/pub/UnidenMan4/SDS200FirmwareUpdate/SDS200_V1.24.00_Main.zip
  - Listed on:
    https://info.uniden.com/twiki/bin/view/UnidenMan4/SDS200FirmwareUpdate
  - Wayback copy: none captured
  - Retrieved: 2026-09-18. Status: verified (downloaded from Uniden's own
    server).

MORE INFORMATION
  - scanners.fubsypoly.com, Uniden SDS200 - Vol 5, Upgrades & Firmware:
    https://scanners.fubsypoly.com/uniden-sds200/vol-5/
  - Reference Library, SDS200 Owner's Manual:
    https://scanners.fubsypoly.com/library/sds200om/
  - Reference Library, Easier to Read SDS100/SDS200 Manual:
    https://scanners.fubsypoly.com/library/easier-to-read-sds100-200-manual/
  - Uniden change log:
    https://info.uniden.com/twiki/bin/view/UnidenMan4/SDS200FirmwareUpdate

Other versions of SDS200 firmware

← All Uniden SDS200 downloads