One of Deco M4R's stuck on old firmware
I own a set of three Deco M4R's. I've bought two of them together and one more separately.
Those two that came together I was able to successfully upgrade to the latest firmware.
However, this additional unit I've bought is stuck on (2.1.8 Build 20201225 Rel. 50156).
I started to have some serious connection issues on my Wifi today, so I unplugged all my Deco and did reboots one by one. Only then I noticed that I can upgrade firmware for the two units from the starter pack.
However, this additional unit firmware update is not available in both mobile and web interface.
To make matters worse, when I tried to manually update firmware using the web interface to force Deco M4(EU)_V2_1.5.0_20210511 version, I got an error that I'm trying to apply an older version.
So, I decided to remove my problematic unit, did a factory reset, set it up with a wired connection as a new network - the mobile app doesn't even show "Update Deco" option and the web interface gives me the same error.
All three units are V2 hardware Deco M4R(EU) and this is here's screenshot of their firmware:
My questions to this community/tp-link:
1. Is there a way to force 1.5.0 firmware upon my rogue unit?
2. Have I bought a unit with some weird firmware 2.1.8 Build 20201225 Rel. 50156 - I can't find references to it anywhere?
3. Should I RMA this unit given inability to upgrade firmware?