Netgear DM200 running OpenWrt;
Xiaomi Mi 3G running PandoraBox (I hope that OpenWrt will be on the same level, so that I can switch to it, otherwise the WiFi signal will be too weak to be usable for me (multiple concrete walls in my house, thicker than usual));
Xiaomi Mi 3 running X-Wrt(?) (this is not the same X-Wrt that has existed for years, this is a chinese one that relies on OpenWrt's official snapshots servers, and apparently contributes to the community (they are also on GitHub) (x-wrt.com). I intend to ask about them), acting as an extender (reverted from Padavan to stock, but PandoraBox was unstable on it, and then I fount the aforementioned X-Wrt, where it is running beautifully).
For anyone wondering, right now the best case scenario for reception from the Xiaomi Mi 3G to the Mi 3 here is ~64%, up from ~%52 with the TP-Link RE200 (there is no better place to place them in the house, the locations of the power or telephone (for the DM200) outlets in the house, make this the best case scenario).
From my room to the Mi 3, the reception is up to ~67%, up from ~%52 with the RE200.
By the way, compared to the prices in my country, the Mi 3G is very cheap (generally the prices for semi-capable routers start from roughly 2x of the Mi 3G's price, and the reception is much weaker with them (had used a TP-Link TD-W9970, (cheapest semi-capable VDSL2 router by a respectable margin, at roughly 2x the price after discount), the Netgear VEGN2600 (ISP provided, no purchases anymore, only rentals), as well as a few other routers, both ISP-provided and not (I have a TP-Link TD-W8961ND, which is more expensive than the 3G, but the ADSL2 (yes) port has malfunctioned since the beginning, and I did not realize it until much later).
And yes, we have WiFi only routers, but 2.4Ghz only routers are more expensive than the 3G here. Fun fact: the DM200 cost roughly the equivalent of ~$75 over here, with the exact same model from Amazon UK costs, including shipping (no free or reduced shipping to my country from any Amazon site), roughly the equivalent of ~$45.