
Carles Camarasa Botella
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It used to work until the update (from Blue to DuoxMe). My fermax has the warning of low signal, but it was the same with the old version and was working. For some reason, it works okay with my girlfriend's phone. EDIT: "Concierge" mode was enabled on the main account. After disabling this option, it works again 😊
Fermax Electronica, S.A.U.
March 24, 2025
Hi Carles, thank you for taking the time to update your review.

Sam Liew (samliew)
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Unable to receive any verification email to Gmail, not even in the spam folder. EDIT: What a silly app review response. I already told you I am unable to REGISTER to LOG IN, hence I can not access SETTINGS to contact you from within the app.
Fermax Electronica, S.A.U.
August 19, 2025
Hi Sam, we are sorry for the inconvenience caused. We have opened an incident to follow up on your case. Please contact us at soporte.duoxme@fermax.com with the ticket number #324097, a description of what happened and, if possible, a photo or video. We look forward to hearing from you.

Nikhil M
The app itself works well—but I cannot pay to upgrade from the free account to the paid plan after my trial expired. I’ve contacted customer service multiple times, changed the country on my account, added a Portugal-based payment card… nothing works. What’s the point of building a good app if customers who want to pay can’t give you their money? Please add a proper web-based payment option instead of relying only on the app store. I genuinely want to pay for Premium—stop making it impossible!
Fermax Electronica, S.A.U.
September 22, 2025
Thank you for your feedback. Your satisfaction is important to us and we will use the feedback you have provided to make future improvements and ensure we provide the best experience for our users.