Hello Community I have the following solution (WITHOUT WARRANTY) for all those who have problems with the filter, as it is very poorly available. I use the following product: Xiaomi MI Air Purifier Pro H 70 W. My tip: 1. switch off the device. 2. use a hoover with a brush attachment and clean the filter thoroughly. Don't forget the inner housing and the air inlets on the side. 3. reinsert the cleaned filter and close the flap at the back. 4. switch the appliance back on. In most cases, the display will still show 0 % = filter replacement? NO! :D This is where the MC Guyver comes into play :D ... as follows: 1. press the switch/button at the back upwards (keep it pressed) where you remove the cover, and at the same time press the power button on the front of the display "Symbol (O)" for at least 10 seconds until a signal sounds and some symbols appear on the display. Then release both buttons. 2. if this is the case, press ONLY the power button "Symbol (O)" on the front of the display again for approx. 10 seconds and then release. 3. after this step, the display will start flashing (green/orange/red) and the air purifier will run simultaneously. Wait a few seconds, then remove the plug from the socket and reconnect it to the power supply after 10 seconds. Et voilà... the filter display shows 100 % again. :D I tried it out today, 13.04.2024, on my two devices at home. Now I'll be watching over the next few days / weeks to see if it works and the filter counter reading drops from 100 % to 99 %, 98 %, 97 % etc. If you use the app for control via the WLAN, you have to register / install the devices again in the app. This shouldn't be a problem. :-) I hope I have been able to help you with this.