I get this question asked allot..
Tools: You need the following: STM32CubeProgrammer : Click Programmer: ST-link v2 or V3 ,Super cheap option: Click Hex/ELF files: Click (Pro for for air purifier PRO, V1.0 For the 3H/2S) Xiaomi Modchip Step 1 Open STM32CubeProgrammer: Press open file (Next to device memory) And navigate/load to the correct HEX/ELF file. Step 2: Connect Connect/Solder/Use pogo-pins… Continue reading How to: Update/Upload firmware in the Xiaomi Modchip.
I was planning to release this way earlier than October, but work and private life got in the way 🙁 Small introduction into the problem: Two distinct signs: Slow to respond to particle changes. Display only shows 001 Cause: The sensor used in the Xiaomi Air Purifiers is the: PMS9003M by Plantpower Datasheet:PMS9003M This sensor… Continue reading Xiaomi 001 PPM FIX, Update!
NEW UPDATED ARTICLE: CLICK Below is an old method, THIS WILL VOID YOUR WARRANTY.In the updated article is a method that won’t void any warranties I received an email from Pekka (Thanks!) who found out about this problem in a video/comment. Two distinct signs: Slow to respond to particle changes. Display only shows 001 Cause:… Continue reading Xiaomi Air Purifier 001 PPM FIX!
After opensourcing the mod chip I wanted to give some insights on how the mod-chip itself works. open source info: click As can be seen in the image above, the system consist out of several sub systems.The two most important sub-systems are: NFC Filter Stm32F412RET6 There are two ways to bypass the NFC filters, Make… Continue reading Xiaomi Air purifier 3H/C/PRO NFC MOD, How does it work?
The following will be released: Schematic B.O.M (Bill Of Materials) Geber Files Software binaries (see below) I will write the following tutorials: How to flash your Modchip How to order your Modchip see below Explanation of how the software works. Schematic: Downloadable PDF: B.O.M. This is quite a simple schematic, the hardest part was finding… Continue reading Xiaomi Modchip open source!
Step 1:Remove the power cord and wait until the device is fully powered off.Failing of this step has a high risk of electric shock or damaging the air purifier. Step 2:Turn the device upside down. Step3:Remove the four rubber feet. (I used a flat screwdriver to wiggle them out) Step 3.5:Remove the four Phillips screws… Continue reading How to install Xiaomi Air purifier Mod Chip to your 2S 3H Pro device.
After a couple of nights tinkering ,PCBA designing , software writing and a couple of PCBA revisions later success: (see GIF , above) Why: Using these air purifiers is a wasteful and expensive experience. There are no third party filters on the market , and no options to disable the NFC check. I wanted to… Continue reading Xiaomi Air Purifier 3H/C/PRO MODCHIP is here!
Yesterday, I received a mail! By a user named : tuxuser. I thought I was alone in the world of Xiaomi Air purifier poking… Since more people are getting involved I decided to update some more information on the web! I dumped the ESP Flash contents using : Link (look closely and you will see… Continue reading Xiaomi Air Purifier 3H Reverse Engineering Part 3: ESP32 DUMP
As stated in the first post, the main PCBA contains a Fremont EEPROM. I used one of many Chinese flash tools (mine is a SP8-F made by fly-pro…) ROM dump: The first thing I do with a ROM dump is to analyze the data using a website called : http://binvis.io I then upload my binary… Continue reading Xiaomi Air Purifier 3H Reverse Engineering Part 2: Fremont EEPROM dump