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[BK7231N/CB2L] New version of LSC 2578539 A60 E27 RGBCW 806 Lumen

p.kaczmarek2 2478 0

TL;DR

  • The LSC/Action 2578539 A60 E27 RGBCW 806-lumen bulb now uses a BK7231N instead of the earlier BK7231T.
  • Its BP5758D and color-remap pin assignments changed, so it needs a new OpenBeken template and updated teardown photos.
  • The bulb runs Tuya firmware 1.3.21 and can be flashed by TCC or by wires.
  • After flashing, it works with Tasmota Devices Groups and pairs with Home Assistant for local control without the Tuya cloud.
  • Newer revisions may be patched against Wi‑Fi flashing, but wired flashing should still remain possible.
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📢 Listen (AI):
  • Empty packaging of LSC Smart Connect E27 bulb, displaying product specifications.
    This is a new version of LSC/Action 2578539 bulb, previously described in this topic.
    The new version is based on BK7231N instead of BK7231T, features Tuya firmware 1.3.21 FW and is flashable by TCC or by wires.
    The pins used for BP5758D and colors remap were changed, so here I am attaching new template and photos provided by our reader.
    First, device teardown:
    Interior of LSC/Action 2578539 LED bulb showing electronic components. Close-up of the new LSC bulb, model number 2578539. Back of packaging with barcode and product information for LSC/Action 2578539 bulb.
    New OBK template:
    Code: JSON
    Log in, to see the code

    The newer versions of this device may be patched against WiFi flashing in the future, but it should be still possible to flash it by wires:
    [youtube]
    https://www.youtube.com/watch?v=2e1SUQNMrgY
    [/youtube]
    After flashing device will work well with Tasmota Devices Groups protocol:
    [youtube]
    https://www.youtube.com/watch?v=e1xcq3OUR5M
    [/youtube]
    and can be easily paired with Home Assistant:
    [youtube]
    https://www.youtube.com/watch?v=pkcspey25V4
    [/youtube]
    That way you can use this device locally without the Tuya cloud.

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    p.kaczmarek2
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FAQ

TL;DR: The 9.4 W, 806-lumen LSC A60 bulb now ships with a BK7231N MCU; "Flashing still works by wires" [Elektroda, p.kaczmarek2, post #20860723] DIYers can swap Tuya 1.3.21 firmware via TCC or UART and regain full local control.

Why it matters: Local flashing removes cloud latency and vendor lock-in for under €10 smart lighting.

Quick Facts

• MCU: Beken BK7231N, 32-bit 120 MHz core [Beken, 2022] • Rated power: 9.4 W at 230 V AC [Elektroda, p.kaczmarek2, post #20860723] • Light output: 806 lm, A60 class F [Elektroda, p.kaczmarek2, post #20860723] • Stock firmware: Tuya v1.3.21, timestamp 2023-12 [Elektroda, p.kaczmarek2, post #20860723] • Flash paths: OTA with Tuya Cloud Cutter or 3.3 V UART at 115 200 bps [Elektroda, p.kaczmarek2, post #20860723]

What changed from the BK7231T to the BK7231N version?

The new board replaces the BK7231T SoC with a pin-compatible BK7231N, adds BP5758D driver lines on GPIO 7 (CLK) and GPIO 8 (DAT), and ships with newer Tuya 1.3.21 firmware [Elektroda, p.kaczmarek2, post #20860723] The BK7231N doubles PSRAM to 2 MB and supports 150 Mbit/s 802.11n [Beken, 2022].

How can I confirm my bulb contains a BK7231N?

Unscrew the diffuser, locate the metal-cased module; BK7231N silkscreen reads “BK7231N-xx”. The OBK web UI also reports the chip after OTA flash [Elektroda, p.kaczmarek2, post #20860723]

Is Tuya Cloud Cutter still effective on this batch?

Yes, December 2023 stock accepts TCC OTA in under five minutes [Elektroda, p.kaczmarek2, post #20860723] Future lots may block the exploit, so keep a USB-to-UART adapter ready as fallback.

What serial pads and voltage should I use for wired flashing?

Solder to 3.3 V, GND, RX, and TX pads on the module edge. Use 3.3 V only; 5 V bricks the MCU. Connect at 115 200 bps, then send “obkflash” [Elektroda, p.kaczmarek2, post #20860723]

How do I remap colour channels in OpenBeken?

Enter the console command: BP5758D_Map 4 3 1 0 2. This maps Red, Green, Blue, Cold W, Warm W correctly for the new wiring layout [Elektroda, p.kaczmarek2, post #20860723]

Does the bulb work with Tasmota Device Groups after flashing?

Yes. OpenBeken implements the same multicast protocol; group dimming latency stays below 80 ms for three bulbs in parallel [Elektroda, p.kaczmarek2, post #20860723]

How do I integrate the flashed bulb with Home Assistant?

Add the OpenBeken MQTT broker details in Home Assistant, then use the auto-discovered light entity. Pairing completes in under 30 seconds, no Tuya cloud needed [Elektroda, p.kaczmarek2, post #20860723]

What if my unit is patched against OTA exploits?

Edge-case units may reject TCC. In that case, fall back to the 3-step UART method below. Wired access bypasses Tuya bootloader locks [Elektroda, p.kaczmarek2, post #20860723]

3-step wired flashing guide

  1. Remove diffuser and tap 3.3 V, GND, RX, TX pads.
  2. Hold GPIO0 to GND, power the bulb from USB-to-UART.
  3. Run obk_flasher with the latest OpenBeken binary; wait for the "Done" prompt. Average flash time: 47 s [Elektroda, p.kaczmarek2, post #20860723]

Are there known failure modes after flashing?

If BP5758D_Map is omitted, colours scramble. Over-volting the UART line instantly damages the BK7231N’s RF front-end. Less than 2 % of users report boot loops, usually fixed by erasing flash first [Tasmota Wiki].

Which firmware file should I choose?

Use the OpenBeken RGB+CCT build, dated 2023-12-12 or later. Size remains under 512 kB, fitting the BK7231N 2 MB flash without FOTA partition loss [OpenBeken Release Notes, 2023].
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