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Sonoff B02-F-A60 Retro/Antique Filament Bulb Teardown and Module Findings [SV6166F] [RM9012GB]

divadiow 
Here's my destructive exploration into the module used in retro/antique/filament Sonoff B02-F-A60 available from Ali Express https://www.aliexpress.com/item/1005004755054049.html

Sonoff B02-F-ST64 LED filament bulb with E27 base for 220-240V, shown on an online store product page.

Sonoff ship these in decent packaging because they're glass. It arrived in a thick pillowed envelope as well as the box with plastic inner shell.

Sonoff B02-F-A60 LED filament bulb and its original packaging on a carpet. Sonoff B02-F-A60 Wi-Fi LED bulb box with features and technical specifications. Blue box of Sonoff B02-F-A60 Wi-Fi LED bulb with drawing and technical information on the package. Sonoff B02-F-A60 filament bulb in its box with the user guide visible. LED light bulb with transparent glass lying on a carpet. Close-up of an LED light bulb lying on a beige carpet, showing the screw base and internal components. A person holding a transparent Sonoff Wi-Fi bulb with visible technical markings and certifications.

I believe the hard foam/glue is a phenol-formaldehyde resin so will be hard to soften/dissolve. I heated the metal fitting and finally managed to pop it off. It broke the LED filament wires as it came apart. The PCB with power converter, capacitors and wifi module is buried in more resin, the metal fitting and a plastic ring. Further removal was destructive. I'm not putting this back together.

A broken LED bulb lying on a light-colored carpet. A rusty metal base of a glass light bulb against a blue surface. Damaged internal electronic component of an LED spotlight with visible corrosion and wires. Damaged LED bulb with exposed burnt electronic components and debris. Close-up of a damaged and corroded electronic circuit board with visible rust, debris, and a protruding white wire. Lamp socket component and its parts on a blue mat, surrounded by small debris. Close-up of the inside of an electronic component with removed casing, showing capacitors. Interior of an LED bulb showing visible electronic components. Close-up of a damaged and partially disassembled electronic power supply with visible components and burn residues. Small circuit board with yellow capacitors and other electronic components on a blue background. A damaged electronic module covered with brown corrosion or residue on a blue surface. Interior of an electronic module with visible capacitors and brown residue, likely a damaged LED bulb circuit.

After scraping enough resin away the module is de-soldered

Sonoff B02-F Wi-Fi module with visible IC and QR code on white PCB, partially dirty with resin residue. RE705-MB-v0.1 circuit board module with exposed electronic components and resin residue. Electronic module with SV6166F chip and pin markings on a blue background. Close-up of an electronic module with a 25.0 MHz crystal oscillator, mounted vertically in front of a ceramic base. Close-up of a PCB module with SV6166F chip removed from a Sonoff lamp, placed on a blue surface.

The MCU is an Icomm-Semi SV6166F (aka CKW04) - the subject of previous musings here https://www.elektroda.com/rtvforum/topic4086605.html

Module RE705-MB-v0.1 also seen here and probably in a few other Sonoff devices: https://fcc.report/FCC-ID/2APN5B02FA19/5455362

The ESOP8 chip is a Reactor-Micro RM9012GB LED driver - datasheet attached

Close-up of a Reactor-Micro RM9012GB chip on a PCB, partially covered by brown resin.

Before continuing I traced every pad/contact:
Close-up of Sonoff RE705-MB-v0.1 PCB with SV6166F chip, labeled GPIO pins, and a pinout diagram. Close-up of the Sonoff RE705-MB-v0.1 module with labeled UART, GPIO, and HSD pins, partially cleared of resin.

so from UART1_TX at 921600 baud we have this log:

Code: Text
Log in, to see the code


I was able to enter the boot menu by sending the "m" character at power-on, as shown in boot log.

Code: Text
Log in, to see the code


Unfortunately I hit "x" next which went straight into erasing the flash and waiting for an upload of new firmware
Code: Text
Log in, to see the code


so that's the factory firmware gone :/

this boot menu/ xmodem and CCCCC console output is very similar to the serial port firmware upgrade step shown in the Hi Flying HF-LTPx30 upgrade document High Flying Wi-Fi Module Operation Guide_20200814.pdf

A screenshot showing firmware update instructions for the HF-LPBX30 bootloader, its command menu, and file upload via Xmodem in a terminal program.

I think my next step will probably be to attempt an upload of something - maybe the HF-LPD1x0 firmware supplied here http://www.hi-flying.com/download-center-1/firmware-1/download-item-hf-lpd1x0-firmware
About Author
divadiow
divadiow wrote 2731 posts with rating 469 , helped 245 times. Live in city Bristol. Been with us since 2023 year.

Comments

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p.kaczmarek2 15 Apr 2025 21:20

Interesting, I've known Sonoff products for BL602 usage, but not for SV6166F. Still, SV6166F doesn't seem to be new, I see mentions dating back to 2019: https://obrazki.elektroda.pl/9547960700_1744744638_bigthumb.jpg... [Read more]

divadiow 15 Apr 2025 21:44

yes indeed. I'm sending various HF firmware to it now to see which boot if any https://obrazki.elektroda.pl/1380039400_1744745156_thumb.jpg Added after 18 [minutes]: these do not h... [Read more]

p.kaczmarek2 16 Apr 2025 07:31

Do we have any firmware backup from other SV6166F device to try flashing? I can see that SV6166F was also used in Sonoff B02-B-A60 bulbs at some point: https://obrazki.elektroda.pl/5569185700_1744780877_thumb.jpg... [Read more]

divadiow 16 Apr 2025 18:07

regarding your other post https://www.elektroda.com/rtvforum/viewtopic.php?p=21520722#21520722, apologies, there's a little side exploration I tried with this Sonoff module regarding USB that I neglected... [Read more]

divadiow 27 Apr 2025 21:04

Paired with eWeLink app https://obrazki.elektroda.pl/1586757500_1745780578_thumb.jpg https://obrazki.elektroda.pl/2978551400_1745780594_thumb.jpg https://obrazki.elektroda.pl/9068433700_1745780596_thumb.jpg... [Read more]