Czy wolisz polską wersję strony elektroda?
Nie, dziękuję Przekieruj mnie tamFișierul firmware bt_voice_m4.ota pentru telecomanda BT VOICE M4 pentru mărci de televizoare
• The .ota file bt_voice_m4.ota is the manufacturer-signed Bluetooth-Low-Energy (BLE) firmware image for the BT VOICE M4 voice-enabled remote.
• It is not distributed publicly; major TV makers push it automatically from the TV’s own firmware update server or from the companion mobile app that pairs with the remote.
• To obtain or reload it you must go through one of the following official paths:
– TV/Set-top-box software update (the TV transfers the file to the remote).
– The vendor’s “Smart-Remote” Android/iOS utility (if supplied for your brand).
– An authorised service centre or the remote-control OEM (often a Telink-/Nordic-based design house in Shenzhen).
• Flashing an unverified copy of bt_voice_m4.ota from the Internet is risky (remote may be bricked, warranty void, copyright violation).
Key points
• No safe, legal public download is available.
• Use the TV’s or vendor’s official update mechanism.
• If the update failed and the remote no longer works, contact the TV maker’s service channel and request the recovery package and flashing jig.
Why the file exists
• The BT VOICE M4 is a BLE remote that supports microphone audio streaming (Voice Assistant) and HID key codes.
• Inside the remote you will usually find a Telink TLSR825x, Nordic nRF52832 or Realtek RTL8763 chipset. These MCUs accept encrypted “OTA-DFU” images with the .ota extension.
• The TV/box acts as the OTA master: when its own firmware detects that the paired remote is on an older build it silently downloads bt_voice_m4.ota from the vendor CDN, then pushes it to the remote over BLE.
Why the file is hard to find
• Vendors protect the image with AES-128 and a signature to prevent cloning.
• A single “BT VOICE M4” commercial name hides several PCB revisions (different flash size, RF front-end, battery gauge). A wrong image irrevocably bricks the MCU because the bootloader rejects or overwrites the radio parameters section.
• EU directives (RED) and US FCC rules oblige manufacturers to keep radio firmware under change-control; hence only signed images are circulated through secure servers.
Typical update workflow
a. TV checks remote FW version over GATT.
b. If outdated, TV downloads bt_voice_m4.ota (or similar, e.g. bt_voice_m4_V236.ota).
c. TV commands the remote to reboot into DFU mode and streams 20-byte BLE packets until CRC-OK.
d. Remote reboots, performs self-test, rejoins as HID and Voice device.
Recovery scenarios
• Soft failure – remote pairs but crashes: remove batteries 30 s, reboot TV, re-pair; TV will retry the OTA.
• Complete brick (no advertising): requires SWD/J-Link probe or Telink “USB burning stick”. This tooling and the hexadecimal DFU key are provided only to authorised service centres.
Hardware identifiers you may need to quote to support
• Prefix on the battery bay label (e.g. “RC-M4-BTV-V2.3”)
• FCC ID / CE NB number
• MCU marking and crystal frequency (16 MHz vs 32 MHz variants)
• BLE voice remotes have moved from proprietary 2.4 GHz to Bluetooth 5.2; vendors now add AES-CCM encrypted OTA by default.
• Matter/Thread road-maps show future remotes using multi-protocol radio (BLE + IEEE 802.15.4), so firmware packages will grow and remain encrypted.
• Some brands (e.g. Xiaomi, Hisense 2023+, Philips Android TV) expose a “Remote Upgrade” menu that shows firmware build strings (for BT VOICE M4 you may see M4_1.1.14-23-08-05).
• File structure example (Telink):
– Header (12 bytes, magic 0x5453).
– Image Info (chip ID, image size, CRC).
– Encrypted payload.
• During BLE DFU the TV sends Write-Without-Response to characteristic 0xFFF2; maximum throughput ≈ 9 kB/s, so a 120 kB image takes ~15 s.
• Firmware is copyright of the remote or TV manufacturer; redistributing bt_voice_m4.ota violates licence terms.
• Tampering can breach radio emissions compliance (RED/FCC), exposing the user to legal penalties.
• From a security standpoint, unsigned firmware could embed key-logging or back-door BLE services.
Potential challenges
• Consumer cannot easily capture the .ota file because the TV transfers it over TLS.
• Bootloader version mismatch may require a two-stage upgrade (service tool only).
• Any public .ota claiming to be “universal BT VOICE M4” is almost certainly for a different hardware revision.
• Even if you manage to decrypt and flash, the secure‐element inside the MCU may refuse pairing due to mismatched device certificate.
• Identify the exact chipset: open the remote and note the QFN package marking; consult Telink TLSR82-Series or Nordic nRF52 SDK documentation to understand DFU flow.
• Review ETSI EN 300 328 and FCC Part 15.247 for RF conformity when altering firmware.
• Look at open-source BLE-remote projects (e.g., Telink B91-Dev-Kit) to experiment with OTA in a lab environment.
bt_voice_m4.ota is a signed, encrypted BLE firmware image used by the BT VOICE M4 remote; vendors deliver it automatically through the TV or a companion app, and they do not publish it for direct download.
For reliability, legality and safety, obtain the update exclusively via your TV’s firmware update mechanism or the manufacturer’s support service. If the remote is bricked, the only secure solution is to contact an authorised service point that has the correct .ota package and flashing hardware.
