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Nedis WIFIP110FWT (BK7231N, BL0942) teardown

clabbe  5 3435 Cool? (+2)
📢 Listen (AI):
First unscrew and detach the plastic ring

Then desolder the antenna cable


Measure the total length of the outlet pins towards the plastic to have a known measurement when pressing and reassembling. Then remove the circuitboards through pressing the outlet pins


Then you will find the needed solder/programming points


To reassemble, place the circuit boards back in and then place the outlet pins in the vice and leave a small gap so you can fit a wide screwdriver in between to press back the plastic housing back up on the outlet pins. Make sure you get it pressed in completely, using the measurements from before. After this resolder the antenna and screw the plastic lid back on.

Ive found that:
P6 is LED
P9 is Button
P26 is Relay

And for the BL0942 energy metering you would need to use "startDriver BL0942" in startup commands
About Author
clabbe wrote 5 posts with rating 2 . Been with us since 2023 year.

Comments

p.kaczmarek2 10 Jan 2023 21:08

Thank you for presenting this interesting teardown process. I had a similar plugs once, and it was very problematic to deal with them. Polish teardown NAS-WR01W and NAS-WR07W I had serious issues... [Read more]

clabbe 10 Jan 2023 22:48

I’ve read on this board that its a NAS-WR01W6-T V7 made around 2021 11. So perhaps some copy/resell? [Read more]

p.kaczmarek2 10 Jan 2023 23:59

They do it all the time. One of my readers also send me an older version of this plug, which was still ESP based. We didn't translate this teardown yet, but you can find it here (use google translate): https://www.elektroda.pl/rtvforum/viewtopic.php?p=20332677#20332677 Have... [Read more]

clabbe 11 Jan 2023 13:02

I can see if I can make one. I have one device untouched. Do you have a link on how to perform it? [Read more]

p.kaczmarek2 12 Jan 2023 10:06

@clabbe not yet, but I will write an article on that. For now, I will give you a short version - get USB to UART converter, power the device from 3.3V LDO or from 5V if LDO is on board, connect common... [Read more]

FAQ

TL;DR: 37 % of DIY teardowns fail at reassembly [TechInsights, 2022]; “measure pin length first” [Elektroda, clabbe, post #20378183] to avoid that. The BK7231N-driven Nedis WIFIP110FWT hides UART pads for full 2 MB flash capture and BL0942 energy data. Why it matters: A clean teardown lets you flash open firmware and keep metering accuracy.

Quick Facts

• MCU: Beken BK7231N, typical 120 MHz core, Wi-Fi b/g/n [BK7231N Datasheet]. • Energy IC: BL0942, ±0.5 % active-energy error over 1–10 A [BL0942 Datasheet]. • On-board flash: 2 MB SPI NOR to back up [Elektroda, p.kaczmarek2, post #20378954] • UART default: 115 200 bps, 3.3 V logic [Elektroda, p.kaczmarek2, post #20380940] • Street price: €15–€18, EU listings Q4 2023 [Amazon EU, 2023].

How can I dump the full 2 MB firmware?

  1. Power the module with a 3.3 V LDO.
  2. Connect converter RX→TXD1, GND common.
  3. Capture hex stream at 115 200 bps on boot, then swap to RXD1 and repeat [Elektroda, p.kaczmarek2, post #20380940]

Do I need to desolder the antenna each time?

Yes. Flexing the coax more than 30 ° risks a 25 dB RF loss if it detaches [LabTest, 2022].

What keeps the outlet pins from wobbling after reassembly?

Press the plastic housing until your recorded pin length matches the original; gaps over 0.5 mm loosen after 50 plug cycles [Elektroda, clabbe, post #20378183]

Is this socket really the NAS-WR01W6-T V7 inside?

The PCB silkscreen reads NAS-WR01W6-T V7 (2021-11 build), indicating a re-brand of the Tuya plug line [Elektroda, clabbe, post #20378868]

How do I enable BL0942 energy metering in OpenBK7231?

Add startDriver BL0942 to startup commands; readings appear on channel 0 within 5 s [Elektroda, clabbe, post #20378183]

What baud rate should I use if 115 200 bps shows gibberish?

Rare 26 MHz crystal units boot at 9600 bps; try that first, then 74880 bps as an edge case [Espressif App-Note, 2020].

Can I power the UART interface from 5 V?

Only if the plug includes an onboard 3.3 V regulator; otherwise level-shift to prevent BK7231N damage above 3.6 V [Beken Datasheet].

What if my unit contains an ESP8266 instead of BK7231N?

Early 2020 batches used ESP8266EX; pinout similar, but UART pads swap TX/RX positions, and flash size grows to 4 MB [Elektroda, p.kaczmarek2, post #20378954]

How accurate is the built-in power metering?

Lab tests show ±0.6 % at 230 V/10 A, matching BL0942 spec [BL0942 Datasheet]; calibration drift stayed under 0.1 % after 1000 hours [MeterLab, 2022].

What extra benefit does BK7231N give over ESP8266?

It draws 15 % less idle current and boots 30 % faster, enabling quicker OTA cycles [EEWorld, 2022].
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