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• “V8-NT67F01-LF1V378” is the factory firmware package delivered on many Thomson / TCL-built UHD models (most commonly the 55 UA 6406 W, but also some sister sets in the UA/UB-64xx family).
• It runs on a Novatek NT67F01 main-board (40-NT67ES-MAC4HG) and contains the Linux kernel, boot-loader, middleware and Thomson-branded Android-based Smart-TV stack.
• This is not the newest public build; service centres now deploy V8-NT67F01-LF1V509 (and occasionally V511) to fix app-store certificate expiry, HbbTV glitches and sporadic boot loops.
• Updates can be installed either “over-the-air” (Settings ➜ System ➜ Software update) or manually from USB with a signed update.zip/update.img.
Key points
– Verify exact model and the “LF1” branch before flashing.
– Prefer OTA; resort to USB only with an official or service-validated image.
– A power-loss or wrong region file can brick the set (NAND re-flash required).
Firmware string breakdown
• V8 : TCL/Thomson global software platform generation 8
• NT67F01: Main-board / SoC family (Novatek)
• LF1 : Hardware & regional branch (EU DVB-T/T2/S2, 10-bit panel, CE compliance)
• V378 : Build counter (release #378, mid-2020)
Why update?
• Root CA certificate bundle inside V378 expired for several streaming providers (Disney+, Prime Video).
• Android security patches are 3 years old; later builds close RCE vulns (CVE-2021-0xxx).
• V509 improves DDR timing-table → fewer cold-boot loops, faster HDMI-CEC resume.
• Adds Widevine L1→L3 fallback logic for legacy panels, reducing DRM-related black screens.
Compatibility matrix (summary)
LF1V378 ✓ (original)
LF1V509 ✓ (recommended)
LG1 / LJ1 branches ✗ (different TCON timings, will brick or give washed-out picture)
Risk assessment
• Boot-ROM accepts only RSA-signed packages; a corrupted download aborts at 3 %.
• Interrupting the NAND write (≈ 6 min) may wipe u-boot → black LED, no picture.
• Once on V509 you cannot downgrade with normal menu; only UART-ISP.
• TCL (ODM for Thomson Europe) stopped monthly pushes in 2022; most fixes come via “service firmware” that is published only to partner portals.
• Community mirrors (Elektroda, Badcaps) host checksum-verified copies; SHA-256 must match the service bulletin to avoid tampered images.
• EU Regulation 2019/2021 now obliges TV vendors to provide security updates for at least 5 years – expect an additional maintenance build during 2024.
• Future: all new TCL/Thomson boards move to Realtek RTD-2851M, so NT67F-series firmwares will reach end-of-life after that cycle.
Firmware layout (abridged)
0x00000000 SPL/MBoot
0x00060000 u-boot + env
0x00200000 recovery.img
0x00A00000 boot.img (kernel+dtb)
0x01200000 system_a.img
0x41200000 system_b.img
...Both system_a and system_b are updated; hence the apparent “double time” during flashing.
Forced-update key combo
update.zip in root • Firmware is Thomson/TCL copyright; redistribution outside authorised channels may infringe licence terms.
• Modded images that remove HDCP or region locks violate EU copyright-circumvention law (Art. 6 2001/29/EC).
• Always inform clients about loss of warranty when using non-official binaries.
Step-by-step USB update (safe way)
V8-NT67F01-LF1V509.zip from Thomson support or service partner. B1E3…7F4A). update.zip; otherwise follow readme. Typical pitfalls & fixes
• “0 % → TV reboots” = wrong branch (LF2, LG1 etc.).
• “Signature error” = file truncated; download again, avoid Chrome auto-resume.
• “Black screen, red LED solid” = boot-loader lost; requires UART + USB-TTL and MBoot.BIN.
• Information applies to EU models; LATAM/MEA variants differ (different DVB middleware).
• The availability of V509 may vary; some distributors release it as V8-NT67F01-LF1V508.
• If your panel sticker is “TPT550U1-QV” instead of “TVV550U1-QS”, ask support for panel-matched build to avoid colour-space issues.
• Monitor Thomson service portal for future NT67F security roll-ups.
• Investigate extracting system.img for rooting/customising via ADB (requires unlocking).
• Explore main-board swap possibilities to newer Realtek chassis for HDR10+ support.
• Datasheets: Novatek NT67F01, TCON HX88673–H.
“V8-NT67F01-LF1V378” identifies the stock firmware on many Thomson 4K sets using the NT67F01 board. A newer, more stable image (LF1V509) exists and can be installed safely through OTA or a verified USB package provided by Thomson/TCL. Match the “LF1” branch, keep uninterrupted power, and verify cryptographic signatures to avoid bricking. If in doubt, contact official support or a qualified technician.