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Exploration notes for Telstra Smart Wi-Fi Booster 3 - M35H-EMR2 made by Arcaydan

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m35-emr2-diary

A set of notes around the Telstra Smart Wi-Fi Booster 3 - M35H-EMR2 made by Arcaydan. It seems to have Arcaydan model WE7202242TA / RE-TA

The objective of this repo is to share the notes and debug functionality for self-educational purposes. I have grabbed a few of these and hoping to understand more about how they work. My contact details are on my profile page if you would like to help me out. I am doing my best to do this the right way but it is my first public exploration.

I have connected to the PL011 and dumped the output in two cases.

Normal is without interruption

Interrupt1 is with key input over the PL011. This produces a console.

To-do

  • Dump interactive responses to a console explore file
  • Post photos of internals
  • Post packet capture between SMG3 and this device on pairing (captured, just need to sanitise)
  • Access web interface - the Gen 2 had one that I managed to get onto, but it does an infinite redirect either when factory reset or paired
  • Dump any firmware
  • Get root access
  • Understand how firmware is checked/updated

Hardware specs

Wi-fi chips

BCM43684 / BCM43684CKRFBG

https://www.broadcom.com/products/wireless/wireless-lan-infrastructure/bcm43684

SoC

BCM6755KFEBG

https://www.broadcom.com/products/wireless/wireless-lan-infrastructure/bcm6755

RAM

Winbond W634GU6NB-09 4Gbit / 512M DDR3L SDRAM

https://www.winbond.com/hq/product/specialty-dram/ddr3-sdram/?__locale=en&partNo=W634GU6NB

NAND

Winbond W25N01GV 1Gbit / 128MB

https://www.winbond.com/hq/product/code-storage-flash-memory/qspinand-flash/?__locale=en&partNo=W25N01GV

Serial

AMBA PL011 UART

Software specs

U-Boot TPL 2019.07 A01 (Jul 02 2021 - 23:34:48 +0800)

U-Boot SPL 2019.07 A01 (Jul 02 2021 - 23:35:01 +0800)

U-Boot 2019.07 A01 (Dec 08 2022 - 15:40:53 +0800) Arcadyan Build, Build: 5.04L.02@314035

Linux version 4.19.151 (tim@sw2-build9) (gcc version 9.2.0 (Buildroot 2019.11.1)) #1 SMP PREEMPT Thu Dec 8 15:13:49 CST 2022

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Exploration notes for Telstra Smart Wi-Fi Booster 3 - M35H-EMR2 made by Arcaydan

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