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• The latest and last official firmware for the Sony BRAVIA KDL-50W656A is PKG 4.612 EUA, released 18-Sep-2024.
• Update paths:
– “Automatic Software Download” over the Internet (preferred).
– “USB Update” with the file sony_tvupdate_2013_4612_eua_auth.zip from Sony’s support site.
• Downgrade is blocked; use only the exact firmware for model KDL-50W656A to avoid permanent damage.
Model specifics
• Year / platform: 2013 Full-HD BRAVIA using Sony’s proprietary Linux-based OS (not Android).
• Main board: 1-888-390-11 (region-dependent suffixes).
• Common age-related issue: eMMC wear causing boot loops (8 red LED blinks).
Firmware role
• Corrects HDMI-CEC hand-shake, Wi-Fi stability, HbbTV bugs, and adds TLS 1.2 for select streaming services.
• Security patches up to CVE-2023-4863 (libwebp). v4.612 is announced by Sony as “final”.
Update mechanisms
a. Automatic (Network)
‑ HOME → Settings → Customer Support → Software Update → Auto/Check.
‑ TV must be on standby overnight and connected to Internet/DVB-T2 broadcast.
b. Manual USB (works even if TV menu is unavailable):
‑ USB stick ≤ 32 GB, FAT32, empty.
‑ Download zip, extract only the *.pkg file to root.
‑ Insert USB → TV detects package → follow prompts (~20 min, several reboots).
c. Forced recovery (for logo-freeze/boot-loop):
‑ Unplug AC, insert prepared USB, press-and-hold TV-front POWER, plug AC, keep holding 5–10 s until LED turns green/amber → release → wait until update completes.
Typical failure points & differentiation from firmware faults
• 8 red blinks → main-board/eMMC corruption; firmware re-flash rarely helps; board or chip swap required.
• 6 or 7 blinks → back-light / panel / TCON issues; unrelated to firmware.
• No USB detection → faulty USB socket or wrong file structure.
• PKG 4.612 EUA is considered “end-of-support”; Sony closed the update channel for W6-series after this build.
• No official Android-conversion path exists; community ports are experimental and require JTAG programming.
• Streaming-service vendors are dropping TLS 1.0/1.1: if a service stops working even on 4.612 the only remedy is external streaming hardware (Chromecast, Fire TV, etc.).
• Firmware file naming convention: sony_dtv0FA40A06A0A6_00004612_15400000.pkg – checksum embedded, hence any change corrupts the header.
• Why FAT32? 2013 Linux boot-loader cannot mount exFAT/NTFS during early update stage.
• Power integrity: TV draws 80–120 W during flash-write; brown-out will brick SPI boot ROM. UPS is strongly advised.
• eMMC expected life-time: ~3 k program/erase cycles; smart-TV logs and app caches accelerate wear → keep “Privacy → Usage & Diagnostics” OFF to reduce writes.
• Using modified or cross-model firmware (e.g., W655A, W654A) violates Sony EULA and can infringe regional digital-rights regulations.
• Rooting or dumping the eMMC voids any residual warranty and, in some jurisdictions, consumer-protection return rights.
• Disposal of bricked boards must follow WEEE/RoHS rules due to lead-containing solder on 2013 production runs.
Preparation checklist
□ Verify model string on rear label (KDL-50W656A, no suffix).
□ Note current firmware in HOME → Settings → Customer Support.
□ Use 8–32 GB USB 2.0 drive, low-level format → FAT32.
□ Unplug all HDMI/CI+ devices to minimise CEC wake-ups during flash.
Step-by-step USB update (standard case)
Forced USB recovery (boot-loop)
• Same stick preparation.
• Unplug AC → insert stick → press & hold TV POWER → plug AC → hold until LED changes.
• No picture for ~1 min; then progress bar appears.
Post-update sanity tests
– HDMI input handshake with 1080p60 source.
– Wi-Fi scan and 5 GHz connect.
– Media playback of H.264 MKV > 8 GB.
– Standby → wake time < 2 s.
• If USB update never starts, try another drive (USB 2.0, ≤ 32 GB, 512-byte sectors).
• Some units shipped with early boot-loader v0.11; those cannot read 64-kB cluster USB sticks – use 16-kB cluster size.
• Firmware cannot be rolled back; keep a copy of user settings manually.
• Panel/bearing parts for this chassis are out of Sony production; main-board refurbs come from salvage.
• Component-level repair: read/write KLMAG4FE3B eMMC with Easy-JTAG, flash clean dump from healthy board.
• Explore open-source “Hybrid firmware” on forums (Elektroda, 4PDA) for advanced users.
• Long-term: integrate HDMI-CEC power-sync between legacy BRAVIA and modern STB via Raspberry Pi as CEC bridge.
• Environmental angle: evaluate retro-fit LED driver upgrade to improve energy efficiency (~-8 W).
PKG 4.612 EUA is the definitive, Sony-signed firmware for the KDL-50W656A. Update automatically via Internet or manually with a FAT32 USB stick carrying the extracted *.pkg file, scrupulously avoiding power loss. If the set refuses to boot or shows 8 red blinks, the root cause is usually eMMC degradation rather than firmware, and the remedy shifts from software flashing to board-level repair or replacement. Observing Sony’s official procedure and using the correct file keeps the risk of bricking to a minimum while extending the useful life of the 2013 BRAVIA.
