Uniden BCD436HP/BCD536HP firmware 1.11.09 (DMR pre-release 3)
=============================================================

WHAT THIS IS
------------
Uniden BCD436HP/BCD536HP firmware 1.11.09 (DMR pre-release 3).

The DMR pre-release 3 of the DMR-capable firmware, posted by Uniden in
mid-2016 ahead of the 1.11.15 public release. Files inside are dated
2016-06-10. Its change list repeats the one published with preview 2 word for
word.

The download is a zip that holds Uniden's notice (a .txt file) and a second,
password-protected zip, BCDx36HP_V1_11_09.zip, containing
BCD436HP_V1_11_09.bin and BCD536HP_V1_11_09.bin. Uniden's notice explains the
password as a small reading test; the password is Sentinel (verified against
the file). The notice states that this is not an official release, has no
Sentinel support and no RadioReference database support, and that DMR items
must be programmed by hand.

APPLIES TO
----------
The Uniden BCD436HP and BCD536HP; each has its own .bin file inside the inner
zip. Copy only the file that matches the scanner.

BEFORE STARTING
---------------
- This is pre-release firmware from the 2016 DMR beta. The public release
  1.11.15 and everything after it supersede it; no reason is known to install
  it today.
- DMR features need the paid DMR key.
- Back up the microSD card and Favorites Lists; keep external power connected.

CONTENTS OF THIS ZIP
--------------------
- DMR_Prerelease_3.zip (4,327,368 bytes), the unmodified Uniden
  file. SHA-256:
  8eea3cb94811678bd137d6e39158a1dc62cc3113d63aa336999988532ef7830c
  It contains:
    BCDx36HP_V1_11_09.zip  (4,325,730 bytes, dated 2016-06-10)
    READ_ME_FOR_PR3_PASSWORD.txt  (2,614 bytes, dated 2016-06-10)
- README.txt, this file.
- SHA256SUMS, SHA-256 checksums of the files in this zip.

INSTALLATION
------------
Uniden's notice gives these steps:

1. Unzip BCDx36HP_V1_11_09.zip using the password Sentinel.
2. Copy the appropriate .bin file to the "firmware" directory that already
   exists on the scanner (connect in Mass Storage mode, or use a card reader).
3. Cycle power.

Later Uniden notes add: never put two main-firmware files in the folder at
once, and do not delete the two .dat files already there.

VERIFYING
---------
On the scanner, go to Menu > Settings > See Scanner Information > Firmware
Version. The screen shows the installed firmware version, the serial number
(ESN) and a checksum. It should read 1.11.09.

IF SOMETHING GOES WRONG
-----------------------
- If the update does not start, check that only one main-firmware .bin file is
  in the "firmware" folder; Uniden's notes say that with more than one file
  the update will not start or will not load correctly.
- If the two .dat files in the "firmware" folder were deleted, the scanner
  will not start properly. Sentinel's Clear User Data restores them but erases
  all user data on the card; restore Favorites Lists afterwards with Scanner >
  Write to Scanner.
- If the card is corrupted, format it with the SD Association's SD Memory Card
  Formatter, run Clear User Data in Sentinel (tick Display all drives), then
  Update Firmware.
- Cutting power while the card is being written can corrupt it. Keep external
  power connected for the whole update.
- Uniden's firmware page warns: "ONLY use Sentinel to upgrade firmware. Some
  users have rendered their scanners non-functional using other update
  methods." A manual file copy is at the user's own risk; Uniden's own
  downgrade notes say it accepts no responsibility for damage.
- Uniden asked beta users not to report problems with pre-release firmware
  directly to Uniden. To leave the beta, run Sentinel's UPDATE > Update
  Firmware.

DOWNGRADING
-----------
Installing this build on a newer scanner is a downgrade and is not
recommended. Return to current firmware with Sentinel's UPDATE > Update
Firmware.

PROVENANCE
----------
- File: DMR_Prerelease_3.zip
- Downloaded from:
  https://info.uniden.com/twiki/pub/UnidenMan4/DigitalMobileRadioUpgrade/DMR_Prerelease_3.zip
- Retrieved: 2026-09-18
- Official page:
  https://info.uniden.com/twiki/bin/view/UnidenMan4/DigitalMobileRadioUpgrade
- Status: verified (the file was served by Uniden's own server and is
  byte-for-byte unmodified)

MORE INFORMATION
----------------
- BCD536HP Upgrades & Firmware (vol. 5):
  https://scanners.fubsypoly.com/uniden-bcd536hp/vol-5/
- BCD436HP/BCD536HP Owner's Manual in the Reference Library:
  https://scanners.fubsypoly.com/library/uniden-bcd536hp-owners-manual/
- All BCD536HP documents:
  https://scanners.fubsypoly.com/library?node=scanners/uniden-bcd536hp
- Uniden BCD536HP firmware change log:
  https://info.uniden.com/twiki/bin/view/UnidenMan4/BCD536HPFirmwareUpdate
- Uniden BCD436HP firmware change log:
  https://info.uniden.com/twiki/bin/view/UnidenMan4/BCD436HPFirmwareUpdate
