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Excellent DECO M4 set (but the AX10 is better)!!
I had bought in 2020 two pairs, that is, 4 DECO M4 units for a 3-story building (+ground floor, +basement = 5 levels of 150m2 each) and after I first connected one alone (as master) to the router with an Ethernet cable, I then downloaded and ran the TPLINK application from my mobile and set it (the one connected with a cable to the provider's router) as the Master access point and gave it (my own) network name and password for my own network.
Then I plugged in the rest, one at a time and completely alone, and they automatically synchronized with the first (master)!!
In the end... I took them and placed one on each floor (if the signal doesn't reach somewhere due to the size of the apartment and many corners, then you can add a second or possibly a third or fourth in a larger space, etc.) and they relay between each other, thus covering large distances with obstacles (walls or machinery)... even from house to house (across or left and right or upstairs-downstairs apartments) and through the application, I named them according to the space they are located in!!
The system says it can connect up to 1000 such DECO-M4 units together!!!
In the end, I went to my Router's page and turned off the Wi-Fi wireless transmission (or just press the button for wireless transmission that turns it off or makes it active), so all its transmission energy is transmitted only from the DECOs and also to prevent the Router's network from being visible (of course, you can always connect to your Router wired or reopen the wireless transmission by pressing its button).
I hope I have clarified things for you - Here at the company https://www.tp-link.com/gr/support/faq/1794/ - you will find more information about the 2 ways of network transmission as an access point or as a repeater - Ethernet Backhaul is a feature that makes it possible to wire the Deco units together-
One month of use later... June 2020.... I found that I had no disconnections or any problems --
So much so that I forgot they exist and they do their job perfectly!! I solved my problem for 5 levels of spaces over 120sqm each.. And I told you in detail... You do what you think is best.

P.S. Nov 2020... everything is going smoothly... In the 3-story building (+ground floor, +basement) I have full coverage on all 5 levels!!
I am extremely satisfied because from the 50 Mbps, I now have (for the past 2 months) 100 Mbps fiber optic and the Deco M4 (at 1 GBit) perform fantastically, ..even though we are 6 users and 6 smart TVs streaming Netflix, with 8 mobile phones surfing freely on Viber and 4 laptops also connected, and the whole system is doing... splendidly!!
It is the best money I have ever spent.... worth every penny and kudos to the company that made this system.

P.S. December 2024 Due to Black Friday, I snagged 2 AX10 units (AC1500 at 1500mb/s) but also with Wi-Fi 6... and thus upgraded the existing network from 2020 with the old 4 M4 units and the 2 new and superior AX10.

I set one of the two new AX10 (AC1500 at 1500mb/s) with Wi-Fi 6 as the new master on a busy floor with many demanding connections where Wi-Fi 6 works wonders compared to Wi-Fi 5!!
Then, on the old master, I simply pressed the reset hole underneath it and it returned to factory settings, then I added it through the application to the existing network.
Well, in the network I had... Everything continues to run smoothly. AND it transmits wirelessly at a speed of 100 MB/S on the same floor/level, measured periodically with the OOCLA speedtest, with my 100 connection... on other floors it drops a little and gradually, with the worst speed performance at the farthest distance with a difference of 3 floors from the central... the 100 drops to 56. which is not a bad performance at all!! If they get cheaper, I will buy more to have as backups for the yards and balconies... so if the neighbor needs it, we can split the bill as well. I will also give him a wi-fi 6 signal (as a guest user) from the application without him being able to enter my family wi-fi network. In the 4 years, I never had disconnections except during power outages... so now I have even forgotten that they exist!! When the FTTH=to the home 1,000 connection comes at some point, I will get a higher speed (again DECO for certainty) from those of the AX10 series (AC 1500) that I installed, for example, the AX40 (AC 5000) etc., even higher speeds AND with wi-fi 6 that operate even more effectively in load sharing than wi-fi 5, but they are of course much more expensive!! I have shared my experiences from the 4 years so far... You can now do what you think is best for your space and finances

I had purchased the TCL 55EP640 Smart 4K UHD 55" in 2020 (I have written a very positive review about its excellent value for money) and because I was very satisfied with it....
I also bought another one in 58" size, the TCL 58P635 58 4K ULTRA HD Smart TV, for €389 in November 2023.
It is flawless in every aspect so far and it is definitely value for money, as it comes with two remotes, one of which has voice commands, while the other does not, and it does not have any delay in remote control response.
With these remotes, I found out that they also work on the old 55" TV that I had mentioned had slow command response in the menu, and it turned out that it was the remote's fault... because when I tried the new TV's remotes to give commands to the old TCL 55EP640 Smart 4K UHD 55" TV, there is no delay anymore!!
I won't write any further analysis of the features (because it would be too long), but you can check what I wrote in the review for the TCL 55EP640 Smart 4K UHD 55" in May 2020, as these are very similar products, which is why I bought it again with the confidence that I am getting something that is worth more than its price and does not lag behind more expensive "so-called" branded products!!

Update in Sep 2023 and after 2.5 years of daily use, the internal non-removable battery "swelled" without any other issues.... but the phone was working perfectly!!... Anyway, I decided to send it to the company's service, where they changed the battery and some extra materials that they use for battery replacement with a cost of €55 (the courier picked it up and returned it to the company with a charge).

MARCH 2021 A few months ago, I bought a 55" TV of the same brand as a "cheap option" with excellent technical specifications (I have already written a review here on skroutz) and as it turned out, it has been a very satisfying experience that I have had so far with the brand, so I also bought their phone, again as a "cheap option" but with excellent technical specifications on 12th March 2021.
Because finding 6GB RAM operating memory with 256GB ROM storage memory that supports a micro SD card up to 512GB is not easy at all, especially in a phone of this price range, which is an AMAZING purchase, considering what it offers and its tremendous value for money, which is unmatched!
When you hold it, it feels solid, lightweight at only 172g, aesthetically beautiful, and its fantastic curved AMOLED 6.47'' display (amoled with gorilla glass like the Sam J-7 I have) shows vibrant, clear, and vivid colors with a resolution of 1080 x 2340 with NXTVISION* and HDR10*!!
The HDR optimization that brings content to life from Netflix, the exclusive display chipset, and the NXTVISION enhancement technology improve contrast and color in real-time for a clearer and more realistic image.

Photography: its (4) four cameras, Rear: 48MP(f1.8/PDAF) Sony IMX582 Exmor RS Sensor + 8MP(f2.2) + 2MP(f2.4) + 2MP(f2.4), Dual-LED flash, HDR*, Front: 16MP(f2.2), take excellent photos and 4K videos at 30 fps!! What is HDR and HDR 10?
In photographic terms, "Dynamic Range" is the difference between the brightest and darkest elements of an image for realistically bright or dark images, without losing small details. "High Dynamic Range" or HDR is a process that extends the dynamic range beyond what the lens of your smartphone can capture, and one of the key factors for meeting the requirements of an HDR display is the ability to decode HDR10 format files.

The TCL's Android 10 operating system (automatically updated to version 11 in June 2021) is very lightweight and has everything without useless applications, while running ALL high-performance games without lag, with multiple windows open (it also has a window holding option and screen sharing 5-% simultaneously), and its battery is a 4500mAh Li-Po non-removable battery that lasts 1-1/2 to 2 days with moderate use.
It opens easily and without hesitation in 3 ways, instantly with a fingerprint (no matter where you place your finger) on the front screen, but also with a passcode or the photo that will be taken during device initialization.
It has Proximity, Accelerometer, Gyroscope, Digital compass, Fingerprint sensor, and (optical face recognition) for facial recognition (even with glasses)!!

The sound from the speaker located at the bottom (not the back) is quite satisfactory and not inadequate.
Initially, I was disappointed that it doesn't have a radio, but that didn't stop me from downloading one of the many radio apps.
Also, in the package, it comes with a SIM card pin, a 30W charger that supports fast charging with a USB Type-C port, and a high-quality transparent silicone case. However, it doesn't come with headphones, probably because it doesn't have a radio (as another user mentioned, it has been disabled due to European legislation, and it may be activated with a future upgrade for DAB radio).

It has Dual SIM (Nano-SIM), GPS/A-GPS/GLONASS/BDS support, a 3.5mm jack, and a USB Type-C 2.0 port for charging and communication, USB On-The-Go, Wi-Fi Direct 5Ghz, hotspot, Quick Charge 3, and many other features.

*The phone is dual SIM and uses the SIM tray (two sides) with a shared slot for a second SIM card or a memory card, which you probably won't need... because it has 256GB or you might use it for your own purposes, like transferring and editing the 4K videos it captures!

*Digital Audio Broadcasting (DAB) is a new way of radio broadcasting through a network of terrestrial transmitters, in addition to analog FM transmission. It provides more options and better information transmission with crystal-clear sound quality. The receiver locks onto the strongest signal it detects. With DAB digital stations, frequencies do not need to be memorized, and audio systems tune in based on the station's name, so there are no duplicate recordings.

P.S. For more information and whether or not it has Gorilla Glass (which definitely has fingerprint protection), read here:
Q: Is TCL 10 Plus protected by Corning Gorilla Glass?
A: Yes, there is Corning Gorilla Glass protection on TCL 10 Plus, and it also supports 3D curved glass at the back and front, which can protect the device from scratches or minor accidental falls.
https://latestmobilefaq.com/tcl-10-plus-faq-nfc-usb-otg-fast-charging-4k-camera-vr-gear/

P.S. 2 Is there an update to the next Android version? ??
YES, there is, and you can call the company's support in Greece, where they ask you for some internal numbers of the phone, and after you provide them, they register it, and after a while, it automatically updates to Android 11 and possibly future versions, as the company has it registered now!
Since the update is large and with many GB, I did it this way and I advise you to set/allow it to update at night and only with Wi-Fi access to avoid consuming a lot of data!
Mine updated this way, and I automatically switched to the next TCL Operating System, Android 11, and so far, I constantly regret not buying another identical phone at the same time because such opportunities, equipment quality, and price don't come every year!
I am completely satisfied with both products from the brand, until now, June 2021, and it will definitely be my first choice for anything else I want if they produce it. I feel such trust and satisfaction for the money I spent on their products.
UPDATE Dec 2023: After the excellent impressions from the other products I bought from the same company, I also bought another television in 58"